With peered servers all mail destined for that domain. In a subsequent process (the VRFY) it will cause the bounce. IN respect to the test, as soon as it was accepted for delivery you were considered an open relay. When in fact the message is being bounced at a later time in the process.
Eric S ----- Original Message ----- From: "Randy Bullard" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, August 21, 2002 12:13 AM Subject: [IMail Forum] peer-groups and smtp security > 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/ > 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/
