We've been running MS's SMTP service for store and forwarding for several months now with great success. However, we've come under quite a few distributed dictionary attacks over the last few days, and this is creating a problem.
I have the MS SMTP service set to deliver all messages through to our IMail machine, and not to attempt delivery itself. This creates the disasterous situation that MS-SMTP requeues dictionary attack messages and tries to send them out, and then rather than reject them itself, sends the rejections on to the IMail server for final delivery. This effectively doubles the traffic load from these attacks. What I want to do is change the setting to allow the MS-SMTP server to deliver the messages itself. Thus if it tries to pass on a message with an invalid email address to the IMail server, the IMail server will reject it and then the MS-SMTP server can turn around and attempt delivery of the rejection itself. Since the overwhelming majority of these messages are forged anyways, I can wipe out the badmail directory every few hours, and I'm not pushing crap messages across my LAN and keeping my IMail server busy dealing with another SMTP server's rejects on top of its own. Does anyone see a problem with this? -- Aaron Clausen [EMAIL PROTECTED] 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/
