# trumail/trumail

:email: :white_check_mark: A Fast and Free Email Verification API written in Go

Repository: https://github.com/trumail/trumail
Canonical: https://ross.abutalabs.com/products/trumail
Homepage: https://trumail.io
Language: Go
License: BSD-3-Clause
License Family: permissive
Topics: verification, docker, email, golang, validation, api
Archived: true
Last push: 2018-06-15T00:20:41+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3246, "days_push": 3002, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1052, forks 229 (observed 2026-08-28T04:03:23.448575+00:00)

## What it is
Trumail is a free, open-source email verification system written in Go that checks address deliverability via SMTP handshakes with mail servers on port 25. It is available as a Go client library, a self-hostable Dockerized HTTP API, and a public API endpoint.

## Use cases
- verify if an email address is deliverable before sending
- self-host an email validation API
- check for disposable email addresses at signup
- validate email syntax and MX records
- reduce email bounces by filtering invalid addresses
- integrate email verification into a Go application

## When to choose
- you want a free, self-hosted alternative to paid email verification services
- you need a simple Go library or Docker image for SMTP-based email checks
- your server can make outbound port 25 connections (e.g., AWS, DigitalOcean)

## When to avoid
- your hosting provider blocks outbound port 25 traffic, such as most residential ISPs
- you need bulk list verification, scoring, or rich metadata like catch-all and greylisting detection
- you want a maintained SaaS with SLAs and support rather than a project with no releases since 2018

## Facets
- artifact type: service
- maturity: maintenance
- function: email, http-server, api-framework, cli
- domain: email, apis, self-hosted, developer-tools
- platform: go, self-hosted, cli
- tags: email-verification, smtp-verification, email-validation, mx-lookup, disposable-email-detection, json-api, automation, docker, linux

## Member repositories
- trumail/trumail (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:23.448575+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:59:46.436184+00:00, confidence not recorded.
  - readme: https://github.com/trumail/trumail (fetched 2026-08-28T04:03:23.448575+00:00, sha 16b83cdbb5be)
  - homepage: https://trumail.io (fetched 2026-08-29T13:01:25.303364+00:00, sha 0ba8450117c9)
  - site_page: https://emailable.com/docs (fetched 2026-08-29T13:01:25.319181+00:00, sha 581e52f2838a)
  - site_page: https://emailable.com/docs/api (fetched 2026-08-29T13:01:25.321118+00:00, sha cdd1269b3065)
  - site_page: https://emailable.com/about-us (fetched 2026-08-29T13:01:25.323060+00:00, sha e2e1f84b764f)
  - site_page: https://emailable.com/ (fetched 2026-08-29T13:01:25.313055+00:00, sha 7359604b1c28)
  - site_page: https://emailable.com/pricing (fetched 2026-08-29T13:01:25.315186+00:00, sha 8776a21940b1)
  - site_page: https://emailable.com/integrations (fetched 2026-08-29T13:01:25.317167+00:00, sha 870431e0bf8d)
  - site_page: https://emailable.com/faq (fetched 2026-08-29T13:01:25.324794+00:00, sha f8c3e95843af)
- Data as of 2026-08-30T08:39:29.467469+00:00.