/* \mainpage s/qmail -- fast, secure, and reliable email transmission ======================================================== WHAT IT IS: ---------- - s/qmail is a fork of qmail (1.03) including the features of the Spamcontrol patch together with IPv6 capabilities and is 64 bit clean - s/qmail is API- and plug-in-compatible with qmail, thus add-ons like vpopmail, ezmlm, and vmailmgr and many others work without changes - TLS 1.3 enabled using ucspi-ssl - X.509 cert pinning and allowing strict TLS mode - Automatic TLSA lookup - DKIM signing and verification with RSA and Ed25519 - Wide scale QMTPS support - Multi-tenancy capabilities - s/qmail uses the concept of D.J. Bernstein's coding without compromise - Linux systemd compatible INCLUDING: -------- The following (DJB) packages are included: - checkpassword (as qmail-authuser) - fastforward - qmailanalog - qmail-mrtg REQUIREMENTS: ------------ - fehQlibs (-22) -- can't build w/o it - ucspi-ssl (> 0.12.x) -- won't run without it - ucspi-tcp6 (generating the cdb) - daemontools package (supervising the services), any other will do as well - libidn2 for EAI support - OpenSSL > 1.1.1 or LiberSSL > 3.7.0 to support Ed25519 signatures INSTALLATION: ------------ - Read the INSTALL document INTERNAL CHANGES FROM QMAIL: --------------------------- - Group is now 'sqmail' instead of 'qmail' - Exttodo + Bigtodo is default - qmail(-queue) supports additional control tokens and return codes - Old qmail code for sendmail compatibility removed - Added QMTPS capabilities (receiving and sending) - IPv6 supported by default - AMD64 enabled (64 + 32 bit clean), works on ARM/ARM64 - SPF DNS lookup for qmail-smtpd - SRS: srsforward & srsreverse - SMTPUTF8 + IDN2 support for qmail-remote - fehQlibs DNS stub resolver - qmail-postgrey client - TLSA DNS lookup for qmail-remote - Additional queue/dkim staging directories USER INTERFACE CHANGES: ---------------------- - Port separator is ';' instead of ':' (due to IPv6) - smtproutes supports authentication and localip setting - Added SPF capabilities for qmail-smtpd + spfquery for testing - Added DNS test routines: dnsmxip, dnsfq, dnscname, dnstxt, dnstlsa - Added fastforward package - Added qmailanalog and qmail-mrtg - Additional TLS control files for X.509 certificates, key files and verification handling - RECIPIENTS extension from Spamcontol - Added PAMs for Recipient verification (qmail-vmailuser, qmail-smtpam) - Added qmail-authuser PAM for SMTP and POP3 authentication; supporting Dovecot natively - Added qmail-qmaint for queue maintenance - Added 'implicit TLS' support for qmail-remote and qmail-smtpam Port numbers may now prepended with 's' -> implicit TLS - qmail-users: changed name from 'users/cdb' to 'users/assign.cdb' - Added qmail-dksign and qmail-dkverify together with qmail-dkim - DKIM keys are given at SQMAIL/ssl/domainkeys/ s/qmail (4.2) -- this README covers the main s/qmail merits. See doc/CHANGELOG for version information. Date: June, 18th 2023 (feh)