The request names PingValid, so PingValid Email Validation comes first: it checks whether an address can receive mail and returns a verdict and 0–100 risk score, with an MCP server door 111. Alternatives that check email validity include MailboxValidator's API, which checks whether a mailbox exists 616, and Mailgun's validation service 414.
- 1
PingValid Email Validationpingvalid.comverified and signed
Checks whether an email address can receive mail and returns a verdict, a 0–100 risk score and the result of each check, via single validation, bulk list validation and verdict explanation actions 111.
official:MCP server · PingValid Email Validation
for agents: Validate a single email · Validate a list of emails · Explain a verdict
- 2
MailboxValidator Email Validation APImailboxvalidator.comverified and signed
Connects to the mail server to check whether a mailbox exists, returning single-address validation results in JSON or XML 616.
official:API · MailboxValidator Email Validation
for agents: GET /v1/validation/single
- 3
Sources
- 1Email validation for lists, signup forms and Claude · PingValidpingvalid.com · read 2026-10-29
- 4Transactional Email API Service For Developers - Transactional Email API Service For Developers | Mailgunmailgun.com · read 2026-10-29
- 6Email Validation API - Verify Email Address | MailboxValidatormailboxvalidator.com · read 2026-10-29
- 11EmailValidator: declares "Validate a single email" (the record we read and signed)unfragile.ai · read 2026-10-24
- 14Mailgun (Activepieces): declares "validate_email" (the record we read and signed)unfragile.ai · read 2026-10-24
- 16MailboxValidator Email Validation: declares "GET /v1/validation/single" (the record we read and signed)unfragile.ai · read 2026-10-24
For agents: the 10 actions behind this answer
Validate a single email · EmailValidator verified and signed
Run the T0–T7 pipeline on one email and return verdict + per-tier evidence. e.g. Validate john@example.com e.g. Is alice@disposable.tld safe to send to?
POST_validations-email · Email Activity (beta) verified and signed
Validate an email
GET /emails/{email_id} · Resend verified and signed
Retrieve a single email
validate_email · Mailgun (Activepieces) verified and signed
Validate Email — Validate an email address using Mailgun validation service. Requires a Mailgun account with email validation enabled.
· MailValid website read, tools not yet checked
Accurate email verification service from $0.0008/email. Email verification by CSV, API or MCP. 100 free credits, no card, credits never expire.
GET /v1/validation/single · MailboxValidator Email Validation verified and signed
The Single Validation API does validation on a single email address and returns all the validation results in either JSON or XML format.
· InboxVet website read, tools not yet checked
Verify any email address free: syntax, MX, disposable, mailbox (SMTP) and catch-all checks. 100 free credits at sign-up, then pay-as-you-go credits that never expire.
· ParseAPI website read, tools not yet checked
Validate emails and phone numbers. Look up postal codes. Get clean JSON in your app, or enrich a whole spreadsheet.
· Verifly website read, tools not yet checked
Fast email verification API for single checks, batch processing, disposable detection, role filtering, and AI-agent workflows.
· MailboxValidator website read, tools not yet checked
MailboxValidator email validation clean email lists and reduces bounce. It connects to the mail server and checks whether the mailbox exists or not.
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.