Messages have been getting stuck in the smtp queue because the
destination doesn't have a MX record. Here's an example:
Aug 9 07:49:34 hoggar postfix/smtp[7034]: 3B95232E1A4: to=<X AT example DOT
com>, relay=none, delay=80142, delays=80142/0.02/0/0, dsn=4.4.3,
status=deferred (Host or domain name not found. Name service error for
name=example.com type=MX: Host not found, try again)
The dns answer is "MX record currently not present". The messages stay
in the queue until the maximal_queue_lifetime expires. However the
example.com destination *does have* an A record. According to rfc 2881:
"If no MX records are found, but an A RR is found, the A RR is
treated as if it was associated with an implicit MX RR, with a
preference of 0, pointing to that host."
So why are the msgs not being sent to the IP address pointed to by the
A record? I have ignore_mx_lookup_error=no and
smtp_defer_if_no_mx_address_found=no (default values), with postfix
version 2.4.3.
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