{"$schema":"https://verifymcp.io/schemas/trust-report.json","schemaVersion":1,"license":{"name":"CC BY-NC 4.0","url":"https://creativecommons.org/licenses/by-nc/4.0/"},"generatedAt":"2026-11-05T20:25:49.204Z","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck","markdownUrl":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck.md","server":{"slug":"io-usefulapi-mailercheck","name":"MailerCheck MCP by usefulapi","registryName":"io.usefulapi/mailercheck","description":"Check MailerCheck credits and lists, and run confirmed asynchronous email verification.","registryStatus":"active","deletedAt":null,"statusMessage":null,"liveness":"live","publisher":{"class":"unknown","claimed":false}},"component":{"slug":"mailercheck","type":"remote","identifier":"https://mailercheck.usefulapi.io/mcp","withdrawn":false,"url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck","version":"1.6.3","transport":null,"scoredAt":"2026-11-05T15:04:09.142Z"},"score":{"total":18,"tier":"low","status":"scored","weekDelta":-42,"history":[{"date":"2026-11-05","total":18},{"date":"2026-11-04","total":18},{"date":"2026-11-03","total":18},{"date":"2026-11-02","total":18},{"date":"2026-11-01","total":64},{"date":"2026-10-31","total":64},{"date":"2026-10-30","total":60},{"date":"2026-10-29","total":60}]},"categories":[{"name":"Endpoint Security","score":46,"verdict":"fail","reasons":["The endpoint's TLS certificate is valid, in date, and uses a strong key.","Authorisation not yet verified: we couldn't confirm whether this endpoint requires it.","HTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven.","HSTS check failed: the Strict-Transport-Security header is absent.","DNSSEC check failed: this domain isn't protected by DNSSEC."],"codes":[{"code":"tls.valid","args":{}},{"code":"auth.unreachable","args":{}},{"code":"https.inconclusive","args":{"reason":"redirect_not_https"}},{"code":"headers.hsts_absent","args":{}},{"code":"dnssec.absent","args":{}}]},{"name":"Transport & Reachability","score":0,"verdict":"fail","reasons":["Transport check failed: declared streamable-http, but the endpoint redirected instead of responding directly."],"codes":[{"code":"transport.redirected","args":{"transport":"streamable-http"}}]},{"name":"Schema Quality & AI Usability","score":0,"verdict":"unverified","reasons":["Schema not yet verified: we couldn't read the endpoint's schema, or could read only part of its tool list."],"codes":[{"code":"schema.unreachable","args":{}}]},{"name":"Stability & Change Management","score":0,"verdict":"unverified","reasons":["Stability not yet verified: not enough scan history yet (needs a 30-day window)."],"codes":[{"code":"stability.insufficient_history","args":{}}]},{"name":"Tool Coverage","score":0,"verdict":"unverified","reasons":["Tool coverage not yet verified: we couldn't read the endpoint's tools, or could read only part of the list."],"codes":[{"code":"toolquality.unreachable","args":{}}]},{"name":"Tool Safety","score":0,"verdict":"unverified","reasons":["Tool safety not yet verified: we couldn't read the endpoint's tools, or could read only part of the list."],"codes":[{"code":"toolsafety.unreachable","args":{}}]},{"name":"Capabilities","score":0,"verdict":"unverified","reasons":["Capabilities not yet verified: we couldn't read the endpoint's capabilities."],"codes":[{"code":"cap.unreachable","args":{}}]}],"inconclusive":["Authorisation not yet verified: we couldn't confirm whether this endpoint requires it.","HTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven.","Schema not yet verified: we couldn't read the endpoint's schema, or could read only part of its tool list.","Stability not yet verified: not enough scan history yet (needs a 30-day window).","Tool coverage not yet verified: we couldn't read the endpoint's tools, or could read only part of the list.","Tool safety not yet verified: we couldn't read the endpoint's tools, or could read only part of the list.","Capabilities not yet verified: we couldn't read the endpoint's capabilities."],"malware":[],"components":[{"slug":"mailercheck","type":"remote","identifier":"https://mailercheck.usefulapi.io/mcp","withdrawn":false,"score":18,"current":true,"url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck","markdownUrl":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck.md"}],"facts":[{"label":"Endpoint","value":"https://mailercheck.usefulapi.io/mcp"},{"label":"Transports","value":"streamable-http"},{"label":"Auth","value":"none"},{"label":"Version","value":"1.6.3"}],"install":{"available":true,"bundleSha256":null},"tools":[{"name":"mailercheck_account","title":"Read MailerCheck account","description":"Read the connected MailerCheck account name, ID and credit balance. Does not verify emails or spend verification credits.","inputs":[],"outputs":[],"hasOutputSchema":false,"hasExamples":false,"tokenEstimate":33},{"name":"mailercheck_credits","title":"Check MailerCheck credits","description":"Read the available MailerCheck verification credit balance without starting verification.","inputs":[],"outputs":[],"hasOutputSchema":false,"hasExamples":false,"tokenEstimate":24},{"name":"mailercheck_lists","title":"List MailerCheck verification lists","description":"Read one bounded page of list summaries, processing status and statistics. Does not create, verify or delete lists. Pagination stays on the MailerCheck API; no response links are followed.","inputs":[{"name":"limit","type":"integer","required":false,"description":null},{"name":"page","type":"integer","required":false,"description":null}],"outputs":[],"hasOutputSchema":false,"hasExamples":false,"tokenEstimate":61},{"name":"mailercheck_get_list","title":"Read MailerCheck list status","description":"Read one existing list's verification status and aggregate result counts. Does not start or restart verification.","inputs":[{"name":"list_id","type":"string","required":true,"description":null}],"outputs":[],"hasOutputSchema":false,"hasExamples":false,"tokenEstimate":38},{"name":"mailercheck_verify_email","title":"Start MailerCheck email verification","description":"Submit one email for asynchronous verification. Spends MailerCheck credits and requires confirm:true. This call is never retried. Read the returned verification ID with mailercheck_verification_result; wait between polls. If the response is lost, check MailerCheck before submitting again.","inputs":[{"name":"confirm","type":"boolean","required":false,"description":null},{"name":"email","type":"string","required":true,"description":null}],"outputs":[],"hasOutputSchema":false,"hasExamples":false,"tokenEstimate":81},{"name":"mailercheck_verification_result","title":"Read MailerCheck email verification result","description":"Read the status and result of a previously submitted asynchronous email check. Does not start new verification. Call once and wait before polling again; no automatic polling is performed.","inputs":[{"name":"verification_id","type":"string","required":true,"description":null}],"outputs":[],"hasOutputSchema":false,"hasExamples":false,"tokenEstimate":53}],"toolsTruncatedAtCapture":false,"diagnostics":{"capturedAt":"2026-11-05T15:04:09.000Z","track":"remote","endpoint":"https://mailercheck.usefulapi.io/mcp","declaredUrl":null,"truncated":false,"tls":{"outcome":"valid","label":"Valid","version":"TLS 1.3","cipherSuite":"TLS_AES_128_GCM_SHA256","chainError":null,"certificates":[{"subject":"CN=usefulapi.io","issuer":"CN=WE1,O=Google Trust Services,C=US","notBefore":"2026-09-13T08:55:39Z","notAfter":"2026-12-12T09:54:12Z","keyType":"ECDSA","keyBits":256,"isCa":false},{"subject":"CN=WE1,O=Google Trust Services,C=US","issuer":"CN=GTS Root R4,O=Google Trust Services LLC,C=US","notBefore":"2023-12-13T09:00:00Z","notAfter":"2029-02-20T14:00:00Z","keyType":"ECDSA","keyBits":256,"isCa":true},{"subject":"CN=GTS Root R4,O=Google Trust Services LLC,C=US","issuer":"CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE","notBefore":"2023-11-15T03:43:21Z","notAfter":"2028-01-28T00:00:42Z","keyType":"ECDSA","keyBits":384,"isCa":true}]},"dnssec":{"result":"insecure","label":"Not signed","name":"mailercheck.usefulapi.io.","steps":[{"zone":".","outcome":"verified","label":"Verified"},{"zone":"io.","outcome":"verified","label":"Verified"},{"zone":"usefulapi.io.","outcome":"insecure_proven","label":"Unsigned (proven)"}]},"auth":{"outcome":"inconclusive","label":"Inconclusive","gate":null,"gateLabel":null,"status":302,"authorizationServers":[]},"httpsRedirect":{"outcome":"inconclusive","label":"Inconclusive","status":302},"transports":[{"transport":"streamable-http","outcome":"redirected","label":"Redirected","status":302,"followed":false}],"provenance":null,"installScripts":[],"installScriptsTotal":null,"vulnerabilities":[],"vulnerabilitiesTotal":null,"dependencies":null},"mismatches":[],"changelog":{"trackingSince":"2026-10-29","recent":[{"id":"chg_01a19ab0-ee8e-791c-86c1-9755731d4c8a","kind":"check.unverifiable","summary":"Stability (0.10 → unverified)","materiality":"security","direction":"regression","scoreDelta":null,"occurredOn":"2026-11-02","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a19ab0-ee8e-791c-86c1-9755731d4c8a"},{"id":"chg_01a19ab0-ee8f-7948-9fbf-b2ccdb7417a4","kind":"check.unverifiable","summary":"Tool safety (pass → unverified)","materiality":"security","direction":"regression","scoreDelta":null,"occurredOn":"2026-11-02","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a19ab0-ee8f-7948-9fbf-b2ccdb7417a4"},{"id":"chg_01a19ab0-ee90-7b77-adb3-46695a302353","kind":"check.unverifiable","summary":"Authorization (pass → unverified)","materiality":"security","direction":"regression","scoreDelta":null,"occurredOn":"2026-11-02","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a19ab0-ee90-7b77-adb3-46695a302353"},{"id":"chg_01a19ab0-ee91-72ea-be0d-f33bf137d46b","kind":"check.unverifiable","summary":"Schema quality (100 → unverified)","materiality":"functional","direction":"regression","scoreDelta":null,"occurredOn":"2026-11-02","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a19ab0-ee91-72ea-be0d-f33bf137d46b"},{"id":"chg_01a19ab0-ee91-7d36-b7c7-e6a4f067c448","kind":"check.unverifiable","summary":"Capabilities (pass → unverified)","materiality":"functional","direction":"regression","scoreDelta":null,"occurredOn":"2026-11-02","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a19ab0-ee91-7d36-b7c7-e6a4f067c448"},{"id":"chg_01a19ab0-ee93-7c84-b8a7-9fa9a2d82116","kind":"check.unverifiable","summary":"Tool coverage (100 → unverified)","materiality":"functional","direction":"regression","scoreDelta":null,"occurredOn":"2026-11-02","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a19ab0-ee93-7c84-b8a7-9fa9a2d82116"},{"id":"chg_01a19ab0-ee94-7219-84d2-68c39e871ca4","kind":"capture.status_changed","summary":"Endpoint reachability (reachable → not serving MCP)","materiality":"security","direction":"regression","scoreDelta":null,"occurredOn":"2026-11-02","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a19ab0-ee94-7219-84d2-68c39e871ca4"},{"id":"chg_01a19ab0-ee94-7775-97aa-a0d811a9ff86","kind":"score.total_changed","summary":"Trust score (64 → 18)","materiality":"functional","direction":"regression","scoreDelta":-46,"occurredOn":"2026-11-02","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a19ab0-ee94-7775-97aa-a0d811a9ff86"},{"id":"chg_01a193fd-43ef-7418-b5a1-6eb98d1c1caa","kind":"check.verdict","summary":"Authorization (partial → pass)","materiality":"security","direction":"improvement","scoreDelta":null,"occurredOn":"2026-10-31","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a193fd-43ef-7418-b5a1-6eb98d1c1caa"},{"id":"chg_01a193fd-43ef-7b26-bac9-da2362a01252","kind":"check.verdict","summary":"MCP protocol (fail → pass)","materiality":"functional","direction":"improvement","scoreDelta":null,"occurredOn":"2026-10-31","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a193fd-43ef-7b26-bac9-da2362a01252"},{"id":"chg_01a193fd-43f0-7195-8a59-ad3ae251bf47","kind":"prompt.added","summary":"New prompt “check_verification_capacity”","materiality":"functional","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-31","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a193fd-43f0-7195-8a59-ad3ae251bf47"},{"id":"chg_01a193fd-43f0-774d-b902-3bde425d2e93","kind":"prompt.added","summary":"New prompt “review_list_verification_progress”","materiality":"functional","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-31","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a193fd-43f0-774d-b902-3bde425d2e93"},{"id":"chg_01a193fd-43f0-7d1d-9755-3d21398d156c","kind":"prompt.added","summary":"New prompt “verify_a_new_email_address”","materiality":"functional","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-31","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a193fd-43f0-7d1d-9755-3d21398d156c"},{"id":"chg_01a193fd-43f1-72be-b475-c543c37ef45d","kind":"server.version_changed","summary":"Server version (1.2.0 → 1.4.0)","materiality":"functional","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-31","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a193fd-43f1-72be-b475-c543c37ef45d"},{"id":"chg_01a193fd-43f1-7807-b337-334b52f63a50","kind":"protocol.version_changed","summary":"MCP protocol version (2025-06-18 → 2025-11-25)","materiality":"functional","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-31","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a193fd-43f1-7807-b337-334b52f63a50"},{"id":"chg_01a193fd-43f1-7d9d-8c30-25fed164fe0d","kind":"score.total_changed","summary":"Trust score (61 → 64)","materiality":"functional","direction":"improvement","scoreDelta":3,"occurredOn":"2026-10-31","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a193fd-43f1-7d9d-8c30-25fed164fe0d"},{"id":"chg_01a19320-ce9d-76ba-901d-5da0e6c9aca6","kind":"server.version_changed","summary":"Server version (1.1.0 → 1.2.0)","materiality":"functional","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-31","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a19320-ce9d-76ba-901d-5da0e6c9aca6"},{"id":"chg_01a191d8-5c54-7cbf-8644-a871cc998f70","kind":"server.version_changed","summary":"Server version (1.0.3 → 1.1.0)","materiality":"functional","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-31","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a191d8-5c54-7cbf-8644-a871cc998f70"},{"id":"chg_01a19064-a7cd-7d24-aff1-a66327f33650","kind":"score.total_changed","summary":"Trust score (60 → 61)","materiality":"functional","direction":"improvement","scoreDelta":1,"occurredOn":"2026-10-31","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a19064-a7cd-7d24-aff1-a66327f33650"},{"id":"chg_01a18dc4-120e-7be4-92b7-f98d9862256b","kind":"server.version_changed","summary":"Server version (1.0.2 → 1.0.3)","materiality":"functional","direction":"neutral","scoreDelta":null,"occurredOn":"2026-10-30","url":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck#chg-chg_01a18dc4-120e-7be4-92b7-f98d9862256b"}],"truncated":true,"feedUrl":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck/changelog.json"},"links":{"html":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck","markdown":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck.md","changelogJson":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck/changelog.json","changelogRss":"https://verifymcp.io/servers/io-usefulapi-mailercheck/mailercheck.xml","external":[{"label":"Remote endpoint","href":"https://mailercheck.usefulapi.io/mcp"},{"label":"Repository","href":"https://github.com/m190/usefulapi-mcp"},{"label":"Website","href":"https://usefulapi.io/mailercheck/"}]}}