Jan-Frode Myklebust: > On Wed, Aug 31, 2011 at 09:16:36AM +0200, Jan-Frode Myklebust wrote: > > I would like to point postfix' virtual_transport at several addresses > > for lmtp delivery, and hopefully want postfix to gracefully handle that > > any one of them might be down. > > > > virtual_transport = lmtp:loadbalancers.example.com:24 > > I mistakingly entered > > virtual_transport = smtp:loadbalancers.example.com:24 > ^^^^ > > and got a few messages bounced: > > Aug 31 10:12:01 mailgw1 postfix/smtp[32598]: E6A2490076: > to=<m...@example.com>, relay=loadbalancers.example.com[192.168.42.15]:24, > delay=0.03, delays=0.02/0.01/0/0, dsn=5.5.2, status=bounced (host > loadbalancers.example.com[192.168.42.15] refused to talk to me: 502 5.5.2 > Unknown command) > > I'm a bit surprised that it lead to a 502, instead of a temporary > error. Is there any way to change this to a temporary error and > have it retry at a later point? It would be nice if the mail-serves > can queue the messages when all my lmtp-servers are down...
The server replies with 502 because LMTP uses LHLO, while SMTP uses HELO or EHLO, and for good reasons: the protocol has different replies for multi-recipient email. You can change 502 into 4xx with smtp_reply_filter (Postfix 2.7 and later). But I recommend that you use the correct protocol instead. http://www.postfix.org/postconf.5.html#smtp_reply_filter Wietse
