Bugfix (introduced: Postfix 2.1): don't log warnings
that some restriction returns OK, when the access map
DISCARD feature is in effect. File: smtpd/smtpd_check.c.

Bugfix (introduced: 20170611): the DB_CONFIG bugfix broke
Berkeley DB configurations with a relative pathname.  File:
util/dict_db.c.

Documentation patches by Sven Neuhaus. Files:
proto/FORWARD_SECRECY_README.html, proto/SMTPD_ACCESS_README.html.

Cleanup: missing mailbox seek-to-end error check in the
local(8) delivery agent. File: local/mailbox.c.

Cleanup: incorrect mailbox seek-to-end error message in the
virtual(8) delivery agent. File: virtual/mailbox.c.