Bounce from lmtp with 5.5.2 Syntax error

Rob Siemborski rjs3 at
Fri Jun 20 15:34:26 EDT 2003

On Fri, 20 Jun 2003, Ted Cabeen wrote:

> Anybody know what would cause this error?  I get it every couple of
> thousand messages on this testing mailbox.
> <mailmonitor at>: host
>     /var/spool/postfix/sockets/lmtp[/var/spool/postfix/sockets/lmtp] said: 500
>     5.5.2 Syntax error (in reply to MAIL FROM command)

If you had the protocol logs of this transaction it would help to diagnose
the problem.

My guess is that postfix is sending a badly formed command of some sort,
but I can't be more specific than that without the logs (enable telemetry
logging for lmtp and find a transaction that fails in this way).

The 5.5.2 error is specifically generated if we can't match the first
character of the command.  So it looks like postfix thinks its sending
MAIL FROM but is actually sending something else (\rMAIL FROM maybe?)


Rob Siemborski * Andrew Systems Group * Cyert Hall 207 * 412-268-7456
Research Systems Programmer * /usr/contributed Gatekeeper

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