Borehole · Risk register · free tier
reacherhq/check-if-email-exists
Free reading: not for reliance
Borehole badge for reacherhq/check-if-email-exists
7882c65 · 1,431 commits · 175 files
Issued 2026-11-03

Significant: one contributor carries the recent work.

1 of 6 assessable dimensions carries significant findings, 3 are adequate and 2 are strong. 12 findings, each with its evidence: the commit, path and lines it rests on, or, when something is missing, what was looked for. One dimension cannot be assessed without an acquirer. Last commit 30 October 2026.

What matters most
  • 03.1 Significant: Bus factor 1: recent work is concentrated in one contributor
What the repository says about itself
  • 05.60 Relicensed: MIT → GPL-3.0 (2019-05-21) → AGPL-3.0 (2020-05-17) → MIT (2026-10-07) LICENSE
Published under today's rules. The verification code attests to this reading as it was stored. This page differs from it as follows.
  • 1 finding from checks Borehole's calibration found wrong more often than right is no longer published.
strong adequate significant findings not assessable from a repository
Provenance disclosure does not affect any rating
0% of the code standing today was written in AI-declared commits
0% of lines still in the tree 488 of 115,429 0% of lines ever added these differ when early hand-written code has since been replaced
82% of lines added in the last 12 months (since 2025-11-03) arrived in AI-declared commits: 15/29 commits, confidence moderate. Also a floor.
15/1,422 commits declaring an agent · Claude Opus 5.5, Copilot
confidence: moderate
  • 22% of non-merge commits carry any trailer at all
  • low trailer coverage: the convention may not be in consistent use
  • no widespread author/committer date divergence
  • deep scan blamed 174 of 174 counted files
23,597 lines excluded as lockfiles, vendored or generated.
This is a lower bound. It counts what the repository declares. Undeclared AI authorship is invisible here, and a single rebase removes the trailers this rests on. Absence of a declaration is absence of disclosure, not absence of AI authorship.

Architecture & Codebase — including AI provenance

01 · strong · ratings ↑

No finding. 11 checks ran and none fired; the rejection log below says why each did not.

Engineering Process & SDLC Maturity

02 · strong · ratings ↑
A note that does not affect this rating
02.6

Almost no process scaffolding exists in the repository

adequate

Of five ordinary markers — CI workflows, CODEOWNERS, a pull-request template, pre-commit hooks, contribution guidance — 1 is present: CI workflows. Branch protection itself is a GitHub setting rather than a file, so this is a reading of proxies and not of the rules themselves. What it does establish is that the process is not written down anywhere a new engineer would find it.

A note that does not affect this rating: in Borehole's calibration, this check's notes were usually true but overstated.

Evidence
process-scaffolding 1 of 5 markers present across 175 tracked files
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

Organization & Key-Person Risk

03 · significant findings · ratings ↑
03.1

Bus factor 1: recent work is concentrated in one contributor

significant findings

In the last 24 months, one contributor authored more than half of 95 non-merge commits among 9 authors; across all history, a quarter or more of 525. This is the single most expensive thing to discover after closing, and the repository cannot tell you whether that person is part of the transaction.

Evidence
git shortlog -sn last 24 months: top author more than half of 95 commits; bus factor 1; 9 authors
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

03.5

The contributor who wrote a quarter or more of this has not committed here for more than three years

adequate

One person authored a quarter or more of 525 commits and has not committed here for more than three years, while the repository has kept moving. The concentration figure alone would not show this. Whoever is changing this code now is not the person who wrote most of it, which is the situation an acquirer is usually told they are avoiding. The history shows only that no commits of theirs landed here, not why.

Evidence
last-commit-by-top-author last commit more than three years ago, measured to the survey
git shortlog -sn top author a quarter or more of 525 commits
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

03.12

The second and third contributors have not committed here for more than a year

adequate

The #2 contributor of the last three years (less than a quarter of the commits) has not committed here for more than two years; the #3 contributor of the last three years (less than a quarter of the commits) has not committed here for more than a year, while the repository is still active. These are the people a buyer assumes would step up if the top contributor stopped. The history shows only that no commits of theirs landed here, not why.

Evidence
git shortlog -sn the #2 contributor of the last three years (less than a quarter of the commits) has not committed here for more than two years; the #3 contributor of the last three years (less than a quarter of the commits) has not committed here for more than a year
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

Product & Engineering Maturity

04 · adequate · ratings ↑
04.19

3% of bug fixes add or change a test

adequate

Of 37 fixes in the last 24 months, 1 touched a test. A fix without the test that would have caught the bug can quietly come back, and the suite never learns from what went wrong.

Evidence
fix commits touching tests 1 of 37
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

Security & Reliability Posture

05 · adequate · ratings ↑
05.2

None of the standard security guard rails are configured

adequate

There is no disclosure policy, no automated dependency updates, no named code owners and no pre-commit configuration. None of these is load-bearing on its own. Their collective absence says that security posture here is whatever the current team happens to remember to do, which is not a posture that survives the team changing.

Evidence
guardrail-scan checked 5 kinds of guard rail across 175 tracked files; 0 present
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

05.6

1 Dockerfile runs the application as root

adequate

No USER instruction switches away from root, so the process runs with full privileges inside the container. It is a one-line fix and an ordinary expectation, which is why its absence is worth asking about: it usually says more about whether anyone has reviewed the deployment than about this container specifically.

Evidence
no-USER-instruction sqs/Dockerfile — runs as root
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

Notes that do not affect this rating
05.27

The build runs third-party code it does not pin

adequate

7 third-party CI actions are referenced by a tag or branch rather than a commit, so they run whatever that tag points to on the day. Tags have been moved to malicious commits in real supply-chain attacks, and a piped script is whatever the server returns that minute. Pinning to a commit is the fix, and it is small.

A note that does not affect this rating: notes like it are common in well-run projects.

Evidence
.github/workflows/deploy_backend.yml .github/workflows/deploy_backend.yml:27 — action pinned by tag
.github/workflows/deploy_cli.yml .github/workflows/deploy_cli.yml:23 — action pinned by tag
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

05.26

22 locked dependencies have published vulnerabilities, 1 high or critical

adequate

22 of 509 locked dependencies match 28 published advisories in OSV, 1 of them rated high or critical. A lockfile says which version is installed, not whether the flawed code is reachable from this product, so each needs a look. Most are fixed by an upgrade, and the advisory names the version. This lockfile pins development tools alongside what ships and does not say which is which, so some of these may never reach a user.

A note that does not affect this rating: in Borehole's calibration, this check's notes were usually true but overstated.

Evidence
Cargo.lock Cargo.lock — hickory-resolver 0.24.4: GHSA-5j98-2g5x-46v6 (high), fixed in 0.26.2
Cargo.lock Cargo.lock — bytes 1.9.0: GHSA-434x-w66g-qw3r (moderate), fixed in 1.11.1
Cargo.lock Cargo.lock — hickory-proto 0.24.4: GHSA-q2qq-hmj6-3wpp (moderate), fixed in 0.26.1
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

05.60

Relicensed: MIT → GPL-3.0 (2019-05-21) → AGPL-3.0 (2020-05-17) → MIT (2026-10-07)

adequate

The root licence changed 3 time(s). Code taken under earlier terms stays under them; check which terms any fork or customer relied on.

A note that does not affect this rating: a licence change is a fact for the first screen, and only a narrowing of rights within two years of the surveyed commit costs "strong".

Evidence
b5b298da3 LICENSE — MIT from 2017-04-25
dbcc81024 LICENSE — GPL-3.0 from 2019-05-21
310db07c0 LICENSE — AGPL-3.0 from 2020-05-17
cb5334256 LICENSE.md — MIT from 2026-10-07
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

Observability & Operations

06 · adequate · ratings ↑
06.8

One request cannot be followed through the logs

adequate

Nothing in the service carries a request or correlation id, and there is no tracing. When a customer reports a failure, the log lines that belong to their request cannot be picked out from everyone else's.

Evidence
request ids no request id, correlation id or tracing found
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

A note that does not affect this rating
06.9

No error reporter is wired in

adequate

Nothing in the service initialises an error reporter (Sentry, Rollbar, Bugsnag, Honeybadger or an APM agent). An exception in production reaches a person only if someone is reading the logs, which usually means a customer reports it first.

A note that does not affect this rating: notes like it are common in well-run projects.

Evidence
error reporting no error reporter initialised
Respond to this finding

Your response is published beside the finding, not instead of it. A finding you can argue with is the point — and a wrong one is calibration data we want.

An owner's response is removed only when it is unlawful, impersonates someone, publishes personal data or a credential, or is not about the finding. Disagreeing with the report is never a reason. To report a response, or to reach us about one, write to takedown@borehole.dev.

Fit with the Acquirer

07 · not assessable · ratings ↑

Not rated: structurally not assessable from a repository. What a person adds here.

Check it on the running system

7 checks against the running system follow from the findings above: what a buyer's engineer will try, how to run it first, and what to have ready. A paid survey of this repository includes them. See the tiers.

A paid survey of a public repository is also reviewed: a language model reads each finding against the code and withdraws only findings it judges the code contradicts, each listed with its reason. The review is a language model's reading of the findings against the code, and it can be wrong. It never adds a finding, never raises a band, and never removes a finding from a proven check or an advisory that affects the surveyed version.

What a person adds

The survey reads what the repository can show. The code cannot settle these questions, and on them this report states nothing. Each says where its answer lives: your own engineer, the company, or an assessor you choose can settle it. Questions marked measured open with something this repository shows.

Architecture & Codebase — including AI provenance

01 · full coverage
  1. Is the architecture right for the next three years of the product? Answer lives in: Your architects, with the product roadmap01.39
  2. Were the home-grown components reasonable choices when they were made, and are they now? Answer lives in: The team's reasoning at the time01.40

Engineering Process & SDLC Maturity

02 · high coverage
  1. Is review real or a rubber stamp? Comment depth and time to approve need the pull request history. Answer lives in: The code host's pull request data02.32
  2. Is delivery planned and measured, or heroic? Answer lives in: The issue tracker: backlog, sprint history, estimate accuracy02.38
  3. How are incidents run, reviewed and learned from? Answer lives in: Tickets, chat and postmortems02.37

Organization & Key-Person Risk

03 · partial coverage
  1. measured One contributor authored a quarter or more of the commits in this history. Is that person part of the transaction, and for how long after it? Answer lives in: The deal terms03.29
  2. Who mentors whom, and would that survive a departure? Answer lives in: The team; review history only suggests candidates03.28
  3. Can the team grow, and who stands behind the top three contributors? Answer lives in: Recruiting data and the org chart03.30
  4. Is the seniority mix sound, and will pay survive your salary bands? Answer lives in: HR data03.31
  5. Is the pace sustainable? Commit times cannot say: git keeps no reliable local time. Answer lives in: Interviews and on-call history03.14
  6. Does the team want to stay after close? Answer lives in: Interviews03.32
  7. How are decisions made and disagreements resolved? Answer lives in: Time with the team03.33

Product & Engineering Maturity

04 · minimal coverage
  1. measured 29 commits landed in the last year, against 65 the year before (-55%). Is that maintenance mode, a pivot, or fewer people working on it? The count looks the same for all three. Answer lives in: The team04.11
  2. Can this team deliver the stated roadmap on the stated timeline? Answer lives in: The data room and the team's record of estimates04.32
  3. Does leadership know about the debt, and is time budgeted to repay it? Answer lives in: Budget and roadmap decisions04.31
  4. Is the engineering shape consistent with the commercial story? Answer lives in: Revenue, customer and churn data04.33

Security & Reliability Posture

05 · partial coverage
  1. measured No threat model is in the tree of what looks like a running service. Does one exist elsewhere, and who owns it? Answer lives in: The security owner05.43
  2. What has actually broken, how often, and how badly? Answer lives in: Ticketing and chat05.41
  3. What did external testing find, and was it fixed? Answer lives in: Reports in the data room05.42
  4. What is the SOC 2, ISO 27001 or GDPR status, and where is the evidence? Answer lives in: Audit reports; policy files in the tree are not evidence05.44

Observability & Operations

06 · partial coverage
  1. measured Nothing in the tree backs up or restores data. How is data backed up, and has a restore ever been rehearsed? Answer lives in: The operations team06.19
  2. measured No alert rule is defined in the repository. Where are alerts defined, who receives them, and when did one last fire? Answer lives in: The alerting tool and the on-call rota06.10
  3. Are the dashboards opened, the alerts acknowledged and the pages answered? Answer lives in: Pager history and dashboard logs06.29
  4. Are the service-level objectives actually met? Answer lives in: Production metrics06.30
  5. Who carries the pager, and how often does it go off? Answer lives in: Pager exports and interviews06.31
  6. What does it cost to run, and how much headroom is there? Answer lives in: Cloud billing and capacity plans06.32

Fit with the Acquirer

07 · none coverage

Not rated: structurally not assessable from a repository.

  1. This is primarily a Rust codebase. Does your engineering organisation already run Rust in production, or would this be the first? 07.1
  2. The bulk of this system sits in core/, backend/, cli/. Which of your existing systems would each of those have to absorb or replace? 07.10
  3. 82% of lines added in the last 12 months (0% of added lines) came through AI-declared commits. Does your organisation have a policy on inheriting and maintaining that code, and does your engineering team's tooling match how it was produced? 07.9
  4. The repository carries deployment configuration (backend/Dockerfile and 2 more). Does that match your deployment and on-call model, or does it need rehosting first? 07.2
  5. What is your tolerance for the findings above remaining unaddressed for the first two quarters after close, given everything else that will compete for this team's time?
  6. Which of these systems duplicate yours, and which get retired? Answer lives in: Your architecture07.11
  7. What will integration cost, and in what order? Answer lives in: The engagement07.12
  8. Where does the team land in your organisation, and who reports to whom? Answer lives in: Your org design07.13
  9. Are there earn-outs, retention packages or contractor IP to assign? Answer lives in: Deal terms07.14
  10. Do customer contracts limit hosting, regions or vendors? Answer lives in: Customer contracts07.15

A human assessment is Borehole's own paid service, €12,000+ (total price is determined per engagement; travel billed at cost). It is not independent of this report: the same business produced both. It is a separate contract, with its own scope, terms and reliance.

Embed the badge

Tied to this commit and this date, and it fades after 90 days — an honest badge is one that expires. A repository with significant findings gets a neutral "read" badge rather than a red one: the library is where the range is visible, not someone else's README.

Borehole badge for reacherhq/check-if-email-exists
[![Borehole](/badge/reacherhq/check-if-email-exists.svg "Borehole free reading: not for reliance. See the full report.")](/r/reacherhq/check-if-email-exists/7882c65)

If you embed it: link it to the report, remove it if the report is delisted, and do not present it as a certification or an endorsement.

Was this reading useful?
Rejection log — 93 signals that ran and did not fire

Appendix: rejection log — 93 signals that ran and did not fire

Published on purpose. A signal that looked and decided not to fire has told you something, and this is the calibration data behind every threshold above.

Looked, and found nothing — 50

SignalWhat it found
04.hotspot_concentration change is spread across the codebase rather than pooling in a few filesfiles 405 · top5 share 0.191
04.debt_markers debt markers are sparsemarkers 12 · per kloc 0.78 · lines read 15,307
04.churn_trend rework is not rising against new worklate delete per insert 0.573 · early delete per insert 0.557
04.compat_layers little code is kept for the old wayshare 0.0 · code files 82 · compat files 0
06.telemetry_presence a telemetry or error-reporting library is referencednote presence only; whether anyone watches it is not visible here · matches 7
06.usage_reporting_default the product's code names no reporting hostsettings on 0 · settings off 0
06.deployed_image_floats every deployed image names a versionimages 3 · floating 0
06.migrate_on_start migrations do not run at container start
03.active_contributors more than one contributor active in the trailing yearall time 35 · active 12mo 6
03.knowledge_silos every substantial directory has been touched by more than one personauthors 35 · directories 3
03.drive_by_contributors a healthy share of contributors committed more than onceshare 0.657 · authors 35 · one commit authors 23
03.critical_path_ownership more than one person changes the critical pathsauthors 9
02.merge_discipline a meaningful share of recent change carries evidence of reviewmerges 2 · window last 24 months · with tracked 5
02.ci_presence CI configuration is present in the working treecount 4
02.test_presence tests are present in a normal proportion to sourcetests 19 · source 83 · test ratio 0.229
02.release_cadence tags are presenttags 146
02.conventional_commits commit subjects generally carry contentsampled 1,422 · low content share 0.01
02.ci_runs_tests CI invokes a test runnerconfigs 4 · with tests 1
02.ci_test_gating no test run in CI is written so that it cannot failconfigs 4
02.dependency_update_cadence dependencies move with the codelockfiles 1 · commits since 1 · days since lockfile changed 0
02.flaky_test_markers tests are not retried until they passtest retries 0 · suite retries 0
02.lint_in_build a linter or formatter runs in the buildwired 1 · ci configs 4 · product files 82
01.burst_import no commit run met both the rate and the net-addition thresholdgap seconds 180 · min add ratio 3.0 · min net added 2,000
01.initial_dump first commit is not a disproportionate share of the codebaseinsertions 23 · share of insertions 0.0001
01.message_uniformity commit subjects vary in wording and lengthlength stdev 13.8 · repeat share 0.02
01.revision_depth most files were revisited after they were first writtenfiles seen 126 · write once share 0.159
01.oversized_modules no module is an outlier against this codebase's own normlargest 542 · threshold 1,000 · median lines 71
01.duplicated_blocks little shipping code is repeated verbatim across filesshare 0.0054 · product files 82 · distinct blocks 5,231
01.build_reproducibility every base image names a versionfloating 0 · from lines 4
01.unfinished_migration no language migration is stalled halfway
01.weights_in_git no model weights are committedfiles 0
05.committed_secrets no credential-shaped strings outside test and fixture pathsnote the working tree only; the history is 05.5 · patterns 8 · files read 161
05.license_present a licence file is presentfound True
05.secrets_in_history no credential-shaped string was ever added outside test and fixture pathspatterns 8 · truncated False · added lines 151,184
05.secrets_management_pattern no environment file is committed outside tests and examplesenv files 0
05.privileged_workloads no workload runs privileged or in the host's namespacessites 0 · behind a setting or built here 0
05.credentials_in_deploy_config deployment configuration references secrets, never holds themfiles 0 · sites 0
05.signing_material no signing keystore or profile is committedfiles 0
05.license_vendored_unlicensed no vendored third-party code is committedcomponents 0
05.license_grant_unclear the licence is recognisable as MITclass permissive · license MIT
05.committed_native_libraries no widely used compiled library is committed to the productlibraries 0
04.deprecations_lingering few deprecations have outlived two yearsolder than two years 0 · files with deprecations 8
04.dependency_churn few dependencies were added and dropped within 60 daysdependencies seen 79 · added in two years 8 · removed within 60 days 0
04.ci_platforms_dropped no platform was dropped from CI in the last two years
04.repository_status the README's first screen states no end, move or freezestatements 0
02.development_elsewhere nothing says development happens elsewhereno pr statements 0 · mirror statements 0 · replayed commit share 0.0
05.paid_edition no directory carries a separate paid-edition licencedirectories 0
04.releases_stopped releases keep pace with developmentmedian gap days 5.0 · days since last tag 4 · commits last 90 days 21
04.release_branch the newest release was cut from the branch surveyedelsewhere 1 · on branch 86 · tags in window 87
03.single_maintainer no file says one person maintains itstatements 0

Could not conclude, or did not apply — 43

Not a clean result. Each says why it could not answer here.

SignalWhy
04.dependency_sprawlno recognised dependency manifest found
04.test_growthRust keeps unit tests inside the files they test, which a count by file name cannot see
04.eol_runtimeno pinned runtime version to check
04.fix_share_trendfewer than six busy quarters to compare
04.schema_churncolumns, once added, stay
04.dependency_redundancyno JavaScript manifest to read
06.structured_loggingnot assessed for Rust: its logging setup is not read
06.telemetry_depthnone at all is 06.1
06.print_loggingnot assessed for Rust: its logger calls are not read
06.alert_rulesno alert rules in the repository; they may live in a console
06.probes_identicalno Kubernetes probes
06.single_replicano Kubernetes deployments
06.environment_branchingnot assessed for Rust, the language the product is written in: this check's patterns read other languages only
06.release_markersfewer than 100 commits in the last year
06.feature_flagsno feature-flag service; flags may live elsewhere
03.bus_factor_trendfewer than three active years to compare
03.joiners_and_leaverstoo few regular contributors to see a trend
02.skipped_teststoo few test files to judge how many are switched off
02.revert_sharetoo few recent commits to judge how often change is undone
02.long_lived_branchestoo few merges to judge (squash and rebase leave none)
02.commit_sizetoo few recent commits
01.swallowed_errorsnot assessed for Rust, the language the product is written in: this check's patterns read other languages only
01.notebook_outputsnot a data or machine-learning repository
05.dependency_pinningno manifest whose pinning can be read without a lockfile
05.outbound_timeoutsnot assessed for Rust, the language the product is written in: this check's patterns read other languages only
05.migration_reversibilitytoo few migrations to judge
05.sql_from_stringsnot assessed for Rust, the language the product is written in: this check's patterns read other languages only
05.shell_from_stringsnot assessed for Rust, the language the product is written in: this check's patterns read other languages only
05.unsafe_deserializationnot assessed for Rust, the language the product is written in: this check's patterns read other languages only
05.tls_verification_offnot assessed for Rust, the language the product is written in: this check's patterns read other languages only
05.resource_limitsno Kubernetes workload manifests
05.public_env_secretnot a frontend
05.unsafe_htmlnot a frontend
05.source_maps_shippednot a frontend
05.cleartext_trafficnot a mobile app
05.dataset_provenancenot a data or machine-learning repository
05.license_copyleft_inheritedno third-party code is committed to this repository, so the licences it depends on are resolved at build time and are not readable here
05.license_manifest_conflictno packaging manifest states a licence
04.flags_accumulatingfew or no feature flags in the history
04.api_versions_coexistingone API version is served, or none
05.project_advisoriesrecord incomplete: no advisory found in the sources that answered; OSV crates.io check-if-email-exists (an empty record for a package published here) did not
05.advisory_recordrecord incomplete: no advisory against the project in the last 24 months; OSV crates.io check-if-email-exists (an empty record for a package published here) did not answer
05.project_exploitedno affecting advisory is on CISA's Known Exploited list
BOREHOLE READING NOT A CERTIFICATION 1SHX-YYJY-5YN1 2026-11-03 · 7882C65 BOREHOLE.DEV/VERIFY

Anyone can check this report against the authoritative record — click the stamp, or enter 1SHX-YYJY-5YN1 at borehole.dev/verify.

The code commits to the 106 checks this run performed, the bands they produced, and the commit they were read at. It does not cover checks written since.

Put the mark in your README

The image is wrapped in a link to the verification page, so a reader can check it rather than take it on trust. If you embed it: link it to the report, remove it if the report is delisted, and do not present it as a certification or an endorsement.

[![Borehole reading, not a certification](https://borehole.dev/badge/reacherhq/check-if-email-exists/7882c65.svg "Borehole free reading: not for reliance. See the full report.")](https://borehole.dev/verify/1SHXYYJY5YN1?via=badge)

Borehole reading 1SHX-YYJY-5YN1, not a certification

Where this scan ran

This scan ran on ordinary cloud infrastructure (cloud-run), not in a hardware-isolated confidential VM. Nothing about it is attested by Google.

What an attested survey proves, and what it does not.

What this scan did with the repository — 7 steps

Written by the steps themselves as they ran, not described afterwards. A hand-written account of a data flow drifts the first time somebody changes the flow and not the account.

AtStepDetail
0.0s read repository metadata from the GitHub API size mb: 4.2authenticated: False
1.3s cloned the repository to a temporary directory depth: full
2.2s read the git history commits: 1431tracked files: 175
16.1s ran the deterministic checks blame pass: Trueread working tree: False
16.1s recorded where this scan ran attested: Falseenvironment: cloud-run
18.4s kept the facts, never the source, for re-reading under new checks
18.4s deleting the working copy

Total 18.4s ·source content sent off this machine: none · calls to a language model: 0 · the clone was deleted when the survey ended

An automated reading of a repository's code and its history up to one commit, with public advisory records. It may be wrong, it is not legal, financial, investment or security advice, and it does not replace diligence by a qualified person. It is provided for information: nobody may rely on it (Borehole's terms, section 3).

BOREHOLE 0.7.15 DETERMINISTIC LAYER · NO MODEL CALLSREAD ON BOREHOLE'S SERVER · CLONE DELETED TAKEDOWNCONTRIBUTED TO THIS REPOSITORY? YOUR RIGHTS