It may function the same as a PIX with mailguard, in the sense that only
certain SMTP commands are allowed to pass...just the required 6 or
7 commands like RCPT To, MAIL From, DATA, etc. Perhaps the MTA that
connected sent like "vrfy" or "expn" or even "ehlo" and it doesn't want to
pass
I recently installed IOS firewall software on our internet router and
started logging the messages to a syslog server. I'm getting a few
Error Message
%FW-3-SMTP_INVALID_COMMAND: Invalid SMTP command from initiator
The weird thing is the IP address of the initiator is that of my own email
se
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