Mailscanner generated duplicate message.

[Mark Sapiro]

Mark Sapiro wrote:
>
>I went through the maillog files and I found 33,469 MailScanner Requeue
>messages. In the first 10,466 (from Nov 25 through Dec 11, 04:04)
>there were no apparent dups. In the remaining log entries, I found 8
>potential duplication incidents, 4 of which involved new batches with
>multiple messages waiting for a total of 15 potential duplicates.
>
>I have reviewed what I did on Dec 10-11, and I think it is likely that
>at that time I stopped and started Postfix without restarting
>MailScanner. If that could cause this, then I think that is likely to
>be the reason. I have since stopped both Postfix and MailScanner and
>restarted MailScanner only and let it start Postfix.
>
>I can provide log segments from the above mentioned 8 incidents if they
>would be of interest. OTOH, perhaps I should just monitor for a few
>days to see if the proper startup of Postfix/MailScanner has 'fixed'
>the issue.


I spoke too soon. In scanning the maillog files, I was only remembering
the last 4 queue ids seen in Requeued: messages. It turns out that
when for example, a Mailman list sends 200+ messages at once, there
can be duplicates separated by many more than 3 intervening Requeued:
entries. I rescanned the logs and found more dups. In particular, I
found one from this afternoon after I had stopped Postfix and
Mailscanner and restarted MailScanner, so that is apparently not the
reason for the duplication.

-- 
Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan