OpenBSD/src r6UxDyeusr.sbin/smtpd srs.c parse.y, usr.sbin/smtpd/smtpd Makefile

   teach smtpd how to do SRS so hosts that act as forwarders don't break SPF.
   this basic implementation does SRS0/SRS1 encoding/decoding, validating time
   and checksums.

   with insight from semarie@, ok eric@ and millert@
VersionDeltaFile
1.1+385-0usr.sbin/smtpd/srs.c
1.262+41-2usr.sbin/smtpd/parse.y
1.93+24-3usr.sbin/smtpd/lka_session.c
1.122+22-2usr.sbin/smtpd/mta_session.c
1.225+18-2usr.sbin/smtpd/smtpd.conf.5
1.639+13-1usr.sbin/smtpd/smtpd.h
1.232+8-1usr.sbin/smtpd/mta.c
1.50+2-1usr.sbin/smtpd/config.c
1.104+2-1usr.sbin/smtpd/smtpd/Makefile
+515-139 files

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