I occasionally encounter a strange problem with the mail queue seemingly not retrying failed messages. The messages show in mailq as having timed out and are a few days old. In the mean time other messages are going through just fine. As soon as I run postqueue -f those messages go through as well. I guess I can set up a cron to issue the postqueue -f command but there is obviously something wrong. Can someone tell me how I might trouble shoot this problem? Thanks.
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