The following entry is in my router log:
3-SMTP_UNSUPPORTED_PARAMETER: Unsupported SMTP parameter
According to Cisco documentation:
The CBAC code has detected an invalid or unsupported parameter in an SMTP command. The parameter "@ or # to ETRN" means that the initiator is trying to send an invalid etrn command. This message is for informational purposes only, but may indicate a security problem.
So exactly does it mean?
Thanks!