8.11.5/8.11.5	2001/07/31
	Fix a possible race condition when sending a HUP signal to restart
		the daemon.  This could terminate the current process without
		starting a new daemon.  Problem reported by Wolfgang Breyha
		of SE Netway Communications.
	Only apply MaxHeadersLength when receiving a message via SMTP or
		the command line.  Problem noted by Andrey J. Melnikoff.
	When finding the system's local hostname on an IPv6-enabled system
		which doesn't have any IPv6 interface addresses, fall back
		to looking up only IPv4 addresses.  Problem noted by Tim
		Bosserman of EarthLink.
	When commands were being rejected due to check_relay or TCP
		Wrappers, the ETRN command was not giving a response.
	Incoming IPv4 connections on a Family=inet6 daemon (using
		IPv4-mapped addresses) were incorrectly labeled as "may be
		forged".  Problem noted by Per Steinar Iversen of Oslo
		University College.
	Shutdown address test mode cleanly on SIGTERM.  Problem noted by
		Greg King of the OAO Corporation.
	Restore the original real uid (changed in main() to prevent
		out of band signals) before invoking a delivery agent.
		Some delivery agents use this for the "From " envelope
		"header".  Problem noted by Leslie Carroll of the
		University at Albany.
	Mark closed file descriptors properly to avoid reuse. Problem
		noted by Jeff Bronson of J.D. Bronson, Inc.
	Setting Timeout options on the command line will also override
		their sub-suboptions in the .cf file, e.g., -O
		Timeout.queuereturn=2d will set all queuereturn timeouts
		to 2 days.  Problem noted by Roger B.A. Klorese.
	Portability:
		BSD/OS has a broken setreuid() implementation.  Problem
			noted by Vernon Schryver of Rhyolite Software.
		BSD/OS has /dev/urandom(4) (as of version 4.1/199910 ?).
			Noted by Vernon Schryver of Rhyolite Software.
		BSD/OS has fchown(2).  Noted by Dave Yadallee of Netline
			2000 Internet Solutions Inc.
		Solaris 2.X and later have strerror(3).  From Sebastian
			Hagedorn of Cologne University.
	CONFIG: Fix parsing for IPv6 domain literals in addresses
		(user@[IPv6:address]).  Problem noted by Liyuan Zhou.