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.

Workaround: reportedly, some res_query(3) implementation
can return -1 with h_errno==0. Instead of terminating with
a panic, the Postfix DNS client now logs a warning and sets
h_errno to TRY_AGAIN. File: dns/dns_lookup.c.

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

Licence: in addition to the historical IBM Public License
1.0, this software is now also distributed with the more
recent Eclipse Public License 2.0. Recipients can choose
to take the software under the license of their choice.
Those who are more comfortable with the IPL can continue
with that license. File: LICENSE.