Mailservers pages:
Dovecot Configuration and usage on OpenBSD.
Exim Using Exim as a flexible and fully configurable mail transfer agent on OpenBSD. Includes installation, TLS setup, local and remote delivery, and common configuration examples.
Postfix Using Postfix as a secure, flexible, and widely supported mail transfer agent on OpenBSD. Includes installation, relay, TLS, and virtual domain support.
Rspamd Configuring Rspamd on OpenBSD for spam filtering and mail classification, with integration examples for smtpd and other MTAs.
smtpd Using smtpd(8) to send and receive email on OpenBSD, with secure default configuration and support for relaying, local delivery, and TLS.