OT, and possibly already discussed -- but...
We've got our systems set up as a peer-group and have established a sinlge ip address to allow relays from. With current settings, open-relay testing comes away negative but for one test --- wherein an exclamation point (!) replaces the @ sign in the RCPT TO: line and the MAIL FROM: line contains whatever@[system-IP] All bonafide headers indicate our messages originate from our mx where the user's mailboxes reside to receive responses, removes, etc, while both soft and hard bounces are directed there as well by the outbound MTA's. Obviously, we don't want our mx-system hijacked so as to relay message-traffic; it's a problem for everyone involved... but for the spammer(s) who would exploit the above-mentioned problem. Is there a means of locking this down without necessarily breaking apart our peer-group and/or interfering with the proper routing of the soft-bounces? 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/
