This specification enumerates and describes Internet mail addresses (mailbox name @ host reference) to be used when contacting personnel at an organization. Mailbox names are provided for both operations and business functions. Additional mailbox names and aliases are not prohibited, but organizations which support email exchanges with the Internet are encouraged to support AT LEAST each mailbox name for which the associated function exists within the organization.

JMAP is the open protocol that replaces IMAP (and CardDAV and CalDAV). It’s faster, simpler, more powerful, and built for how email works today.

Mailpit - email & SMTP testing tool with API for developers

Mailpit is a small, fast, low memory, zero-dependency, multi-platform email testing tool & API for developers.

It acts as an SMTP server, provides a modern web interface to view & test captured emails, and contains an API for automated integration testing (read more).

A comprehensive email domain validation library. Supports DNS, MX, SPF, SMTP, DKIM, DMARC, BIMI, TLSRPT and MTA-STS.

MX record validation SMTP server connection testing DKIM record lookup DMARC policy validation MTA-STS support (RFC 8461) IPv4/IPv6 support Local IP blocking DNS failover resolvers Punycode/IDN support TypeScript support