How do I disable application layer filtering of SMTP traffic on my PIX firewall from the PDM? I need to do this in order to fix a problem where outbound emails through Microsoft Exchange 2003 sits in the SMTP queue and then comes back with an error message, "An SMTP protocol error has occurred."
Some of the email goes out fine, but depending on the domain name, it may or may not sit in the queue and never get delivered.
With a PIX, there are a couple of issues that can cause this. Assuming you are running PIX 6.3x....
1 - smtp fixup. Did you disable this?
no fixup protocol smtp
2 - outbound IP address. Is your exchange
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