s/qmail 4.3.07

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+/* \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 (-24) -- 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 LibreSSL > 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
+- Less single character buffering for I/O; convenient buffer sizes 
+
+
+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, POP3, and IMAP4 authentication; 
+  supporting Binc IMAP and 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/<domain>
+- Authentication support for BincIMAP (separate package)
+- Added qmail-ldapam as installable option (tbd)
+
+
+DEDICATION
+----------
+- Niklaus Wirth - creator of PASCAL (A Plea for Lean Software)
+- Niklaus Wirth: "Eine Optimierung beim Programmieren erfordert Zeit"
+[https://www.heise.de/hintergrund/Niklaus-Wirth-Diese-schnell-erstellten-Programme-enthalten-auch-mehr-Fehler-9587266.html]
+
+ 
+s/qmail (4.3) -- this README covers the main s/qmail merits.
+
+See doc/CHANGELOG for version information.
+
+Date: Janary, 8th 2024 (feh)