Wietse Venema wrote:
Mike Gering:
Is there a way to configure postfix so that it will attempt to use
direct delivery before relaying to another host?
Postfix looks up MX records by default, and can be configured to
add an "extra" MX host (with smtp_fallback_relay) that is given
the worst possible MX preference.
Note that if any host replies with a permanent error (5xx code) to
MAIL FROM, RCPT TO, DATA or end-of-data, Postfix will delete the
recipient(s) from the queue file and not try an alternate host for
those recipients.
However, I see occasional email abuse from EC2, so it is possible
that the EC2 IP address range had a bad email reputation.
In addition, many ISPs reject or silently discard mass mailings
from anywhere unless prior arrangements have been made.
Wietse
Unfortunately, the failures I see are 5xx. I checked the IP address
(174.129.10.202) and AFAIK it is not blacklisted. The site is www.ci.hillsborough.nc.us and is
obviously not a spam source. I'm surprised and disappointed that Amazon
does not provide a solution for legitimate customers.
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