We are running Imail 8.05 behind a cisco 2620 with firewall.  I opened ports 25 and 110.
 
No users using outlook or outlook express could send e-mail to any outside e-mail address.  Error was 550-  Unable to relay.
 
It worked ok from web messaging.  There was no problem after removing the firewall, so this is a Cisco configuration issue.
 
My question is what ports need to be open on the cisco for this to work correctly.
 
 
Help
 
Thanks

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