1 """

     2 Email message and email sending related helper functions.

     3 """

     4 

     5 import socket

     6 

     7 

     8 # Cache the hostname, but do it lazily: socket.getfqdn() can take a couple of

     9 # seconds, which slows down the restart of the server.

    10 class CachedDnsName(object):

    11     def __str__(self):

    12         return self.get_fqdn()

    13 

    14     def get_fqdn(self):

    15         if not hasattr(self, '_fqdn'):

    16             self._fqdn = socket.getfqdn()

    17         return self._fqdn

    18 

    19 DNS_NAME = CachedDnsName()