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From: Wietse Venema (wietseporcupine.org)
Date: Mon Apr 14 2008 - 20:03:31 CDT
> Thanks. Actually I had looked at those (821 not 2821, but they're
> similar), and I thought a bad date might be seen as a syntax error. I
> suppose however that "syntax error" refers to [E]SMTP commands, not to
> message formatting?
SMTP error codes are three digits, without a dot.'
> What about 5.4.7?
Those are not SMTP error codes.