Name: servername
Type: STRING
Default-Value: NULL
Last-Modified: 2.3.17

This is the hostname visible in the greeting messages of the POP, IMAP and
LMTP daemons. If it is unset, then the result returned from gethostname(2)
is used.  This is also the value used by murder clusters to identify the
host name.  It should be resolvable by DNS to the correct host, and unique
within an active cluster.  If you are using low level replication (e.g.
drbd) then it should be the same on each copy and the DNS name should also
be moved to the new master on failover.
