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G'day Daniel,
I'd be most keen to have a look through the Exim logs and see if we can identify a specific delivery issue.
If there's an underlying problem (e.g. dns unavailable, destination host for mailing list RCPT's down, etc) preventing delivery, forcing a retry of the queue won't do heaps.
Say you have one host in the queue whose scheduled to receive a thousand or so messages - if that one host is 4xx'ing you upon initial connect, or, you flat-out can't connect to it, the queue isn't going to move.
If failed connection is indeed the case, it'd be a matter of the usual requisite network troubleshooting bits, e.g. try from a different host, snag a packet capture, etc.
If however, you're getting a 4xx error upon initial connect, you're somewhat limited to engaging the admin of the remote site and working with him or her to find out why they're tempfailing your messages.
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