> I originally thought of that idea as well as moving the mail server > to a new IP address, but coordinating that change with over 1000 > users from 50 different businesses is simply not feasible.
If you upgrade to 8.2x, the auth-only daemon can listen on port 25 (as it does currently), while the daemon that accepts mail from your anti-spam proxy can listen on a different port. The users won't know the difference, while the proxy would need what I'd expect would be an instantaneous adjustment to send to port nnnn rather than port 25. Port 587, the submission-only port, is indeed an industry standard, and has been largely interpreted to mean authenticated-submission-only (though this is not the only means of implementing the facility). If you've been getting away with port 25 (meaning that none of your users have it blocked by their ISPs) then you don't need to use well-known-port 587 for this service, but can take advantage of it nonetheless. --Sandy ------------------------------------ Sanford Whiteman, Chief Technologist Broadleaf Systems, a division of Cypress Integrated Systems, Inc. e-mail: [EMAIL PROTECTED] SpamAssassin plugs into Declude! http://www.imprimia.com/products/software/freeutils/SPAMC32/download/release/ Defuse Dictionary Attacks: Turn Exchange or IMail mailboxes into IMail Aliases! http://www.imprimia.com/products/software/freeutils/exchange2aliases/download/release/ http://www.imprimia.com/products/software/freeutils/ldap2aliases/download/release/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
