Changes from release announce:
* OpenSSL related (all supported Postfix versions).
o Some people have reported program crashes when the OpenSSL
library was updated while Postfix was accessing the Postfix
TLS session cache. To avoid this, the Postfix TLS session
cache ID now includes the OpenSSL library version number.
This cache ID is not shared via the network.
o The OpenSSL workaround introduced with the previous stable
and legacy releases did not compile with older gcc compilers.
These compilers can't handle #ifdef inside a macro invocation
(NOT: definition).
* postscreen(8) related (Postfix 2.9, Postfix 2.8).
o To avoid repeated warnings from postscreen(8) with "connect
to private/dnsblog service: Connection refused" on FreeBSD,
the dnsblog(8) daemon now uses the single_server program
driver instead of the multi_server driver. This one-line
code change has no performance impact for other systems,
and eliminates a high-frequency accept() race on a shared
socket that appears to cause trouble on FreeBSD. The same
single_server program driver has proven itself for many
years in smtpd(8). Problem reported by Sahil Tandon.
* Laptop-friendly support (all supported Postfix versions). A
little-known secret is that Postfix has always had support to
avoid unnecessary disk spin-up for MTIME updates, by doing
s/fifo/unix/ in master.cf (this is currently not supported on
Solaris systems). However, two minor fixes are needed to make
this bullet-proof.
o In laptop-friendly mode, the "postqueue -f" and "sendmail
-q" commands did not wait until their requests had reached
the pickup and qmgr servers before closing their UNIX-domain
request sockets.
o In laptop-friendly mode, the unused postkick command waited
for more than a minute because the event_drain() function
was comparing bitmasks incorrectly on systems with kqueue(2),
epoll(2) or /dev/poll support.
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