Messages hang in the SMTP queue in Exchange System Manager - An SMTP protocol error has occurred
Posted on 2007-04-10
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.