No kidding! I'll take a closer look then.
Eddie Cornejo, Sys Admin Tom Rowe & Associates 956-412-6600 Ext.10 Toll Free USA 888-866-7693 Toll Free Canada 877-866-7693 http://www.tomrowe.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bill Landry Sent: Friday, June 04, 2004 5:44 PM To: [EMAIL PROTECTED] Subject: Re: [IMail Forum] Any solution for this? ----- Original Message ----- From: "Eddie Cornejo" <[EMAIL PROTECTED]> > Is it possible for IMGate to know about valid accounts on the Imail > Server in order stem the tide of dictionary attacks. I see that > vamsoft can do it via AD, but I'm using an external SQL database. Both > solutions sound compelling. The latest version of Postfix supports verify feature where the sending mail server is delayed a split second before the response to the "recpt to" command given, while Postfix queries the IMail server to see if the e-mail account exists or not. If it does, Postfix accepts the message for delivery and logs the e-mail address in the good table of a local btree database for future referrence. If the account does not exist, Postfix responds with a 550, and rejects the delivery and logs the e-mail address in the reject table of the database. New delivery attempts query the local database before posting a query to IMail. There are separate expiration rules to manage the storage and purging of both good and bad e-mail address from the database. Works quite well for us and does not even add more than a second to the overall message processing time. Bill 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/
