H Haraka Fast, highly extensible, and event driven SMTP server. Self-hostedOpen sourceCommunication - Email - Mail Transfer Agents 5 628MITNodejsmis à jour le oct. 2026
O OpenSMTPD Secure SMTP server implementation from the OpenBSD project. Self-hostedOpen sourceCommunication - Email - Mail Transfer Agents 586ISCCmis à jour le sept. 2026
D DragonFly A small MTA for home and office use. Works on Linux and FreeBSD. Self-hostedOpen sourceCommunication - Email - Mail Transfer Agents 266BSD-3-ClauseCmis à jour le août 2026
C chasquid SMTP (email) server with a focus on simplicity, security, and ease of operation. Self-hostedOpen sourceCommunication - Email - Mail Transfer Agents Apache-2.0Go
C Courier MTA Fast, scalable, enterprise mail/groupware server providing ESMTP, IMAP, POP3, webmail, mailing list, basic web-based calendaring and scheduling services. Self-hostedOpen sourceCommunication - Email - Mail Transfer Agents GPL-3.0C
E EmailRelay A small and easy to configure SMTP and POP3 server for Windows and Linux. Self-hostedOpen sourceCommunication - Email - Mail Transfer Agents GPL-3.0C++
E Exim Message transfer agent (MTA) developed at the University of Cambridge. Self-hostedOpen sourceCommunication - Email - Mail Transfer Agents GPL-3.0C
Postfix Fast, easy to administer, and secure Sendmail replacement. Self-hostedOpen sourceCommunication - Email - Mail Transfer Agents IPL-1.0C
S Sendmail Message transfer agent (MTA). Self-hostedOpen sourceCommunication - Email - Mail Transfer Agents SendmailC