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Postfix Documentation
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Record the SMTP session with a network sniffer

This example uses tcpdump. In order to record a conversation you need to specify a large enough buffer with the "-s" option or else you will miss some or all of the packet payload.

# tcpdump -w /file/name -s 2000 host and port 25

Run this for a while, stop with Ctrl-C when done. To view the data use a binary viewer, or ethereal, or use my tcpdumpx utility that is available from

Postfix Documentation
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