ports/149897: Take maintainership of mail/postgrey port

[Darren Pilgrim]

edwin at FreeBSD.org wrote:
> Synopsis: Take maintainership of mail/postgrey port
> 
> State-Changed-From-To: open->feedback
> State-Changed-By: edwin
> State-Changed-When: Mon Aug 23 02:40:18 UTC 2010
> State-Changed-Why: 
> Awaiting maintainers feedback (via the GNATS Auto Assign Tool)
> 
> http://www.freebsd.org/cgi/query-pr.cgi?pr=149897

The port is unmaintained as of ~3 hours prior to my PR.  Maintainer 
reset was commited by linimon @ 2010-08-22 23:49:55 UTC.