Hi,

I have a postfix mail server that successfully delivers thousands of
messages per day, primarily to the same smarthost connected to it.
However, I have a number of messages that are stuck in the queue with
timeout errors:

 said: 421 smtp01.example.com Error: timeout exceeded (in reply to end
of DATA command))

I've read through the debugging and logging pages at postfix.org, and
have increased the logging, but once you increase it to a certain
point, it becomes impossible to separate the signal from the noise.
How can I increase (or capture) the logging for either specific
messages, or increase it only for messages stuck in the queue?

Can anyone give me an idea why this problem would occur in the first
place, only on specific messages? It doesn't seem to be related to
size, load on the server or receiving system, or network issue,
because it delivers tens of thousands of other messages without
incident. There are no errors on the ethernet interfaces.

There are also errors that indicate the message may be delivered more than once:

timed out while sending end of data -- message may be sent more than once)

It's difficult to track these down, though, so I can't tell if they
actually have been delivered.

Thanks,
Alex

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