Public bug reported:
Setting localhost in postfix_lmtp works against Postfix defaults and breaks delivery.
Reason: The Postfix lmtp client only uses dns queries by default to search for hostnames. If the DNS server does not provide an answer for "localhost" delivery from the lmtp client to mailman fails.
Solution: Provide "127.0.0.1" instead of "localhost". This does not require DNS and is even faster because it saves DNS lookups.
** Affects: mailman Importance: Undecided Status: New
** Tags: 3.0 mailman