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How do I check if mail is "stuck"?

I've tried googling but cannot find anything relevant. What am I looking for that indicates that a message is "stuck" or "holding-up" the queue?

I know the obvious indication is that the mail queue is growing, but how do I find the message that is causing the issue?

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Is there any relevant information in your logs ? – Iain Jun 28 '12 at 7:49
Stop using QMail. It's horribly antiquated and hasn't been updated in 14 YEARS. It doesn't all kinds of nasty hackery and has serious security problems. Bail and use something else. – Chris S Jun 28 '12 at 12:48
I cant make the company I work for stop using qmail on over a 1,000 servers... If it was my way we'd be using postfix. – jersten Jun 28 '12 at 13:37
+Chris S I hate to break it to you but you are wrong. QMail has been updated multiple times since JMS originally released the code. I agree with the nasty hackery but still it is that nasty hackery that makes it such a damn powerful system. It is not for the faint hearted and in the era that everything is in a simple rpm/deb file where you install and forget you need to know what you are doing to install it. – thanosk Jun 28 '12 at 13:47

There is no way a that a single mail is holding up the whole queue. Qmail spawns enough processes that many emails are sent concurrently so even if a single of those processes locks up for some reason emails will still be delivered.

Most probably there is a different matter and a lot of emails are being rejected for a different reason. Check the relevant log files to see any error msgs. Also check the queue to see which msgs have not been delivered yet

You can use a tool called qmHandle to check your queue You can get it from here.

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Well then QMail is VERY BADLY configured. check out the concurrencyremote value in control directory and make it greater than 1. If it is already greater than 1 then there is some other reason everything locks up when a single email cannot be send that has nothing to do with QMail – thanosk Jun 28 '12 at 13:45

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