This is an example of what I am talking about. The apparent sender of these emails is [EMAIL PROTECTED] Stammerer.com does not have a listed mx record. The SMTP server that sent the mail is 68.206.124.231. My argument is that the NDR should not be sent to [EMAIL PROTECTED] The NDR should be sent to 68.206.124.231. If that SMTP server feels that [EMAIL PROTECTED] is a valid sender through their server, then they should be able to route the NDR on their end accordingly. This way the RFC is satisfied because you have sent an NDR. If the SMTP server that sent the mail has problems delivering that NDR so be it.
It is very easy to spoof an "Mail From:" address, but it is much more difficult to spoof the SMTP server that sent the mail. But back to my original question? Can I stop my IMAIL server from sending NDR's at all? If not, can I setup a rule that applies to all outbound messages? [68.206.124.231] HELO localhost 10:21 04:49 SMTPD(abb20d4d0000292f) [68.206.124.231] Mail From: <[EMAIL PROTECTED]> 10:21 04:49 SMTPD(abb20d4d0000292f) [68.206.124.231] Rcpt To: <[EMAIL PROTECTED]> 10:21 04:49 SMTPD(abb20d4d0000292f) [x] looking up odryna.com in HOSTS 10:21 04:49 SMTPD(abb20d4d0000292f) [68.206.124.231] ERR jeep.lakespeed.com invalid user <[EMAIL PROTECTED] 10:21 04:49 SMTPD(abb20d3600002930) [10.0.90.23] connect 68.206.124.231 port 1273 10:21 04:49 SMTPD(abb20d3600002930) [68.206.124.231] HELO localhost 10:21 04:49 SMTPD(abb20d3600002930) [68.206.124.231] Mail From: <[EMAIL PROTECTED]> 10:21 04:49 SMTPD(abac0ce00000292e) [69.60.100.230] C:\IMail\spool\Dabac0ce00000292e.SMD 3112 10:21 04:49 SMTPD(abac0ce00000292e) performing antispam checks 10:21 04:49 SMTPD(abb20d3600002930) [68.206.124.231] Rcpt To: <[EMAIL PROTECTED]> 10:21 04:49 SMTPD(abb20d3600002930) [x] looking up odryna.com in HOSTS 10:21 04:49 SMTPD(abb20d3600002930) [68.206.124.231] ERR jeep.lakespeed.com invalid user <[EMAIL PROTECTED] 10:21 04:49 SMTPD(abb30d5300002931) [10.0.90.23] connect 68.206.124.231 port 1274 10:21 04:49 SMTPD(abb30d5300002931) [68.206.124.231] HELO localhost 10:21 04:49 SMTPD(abb30d5300002931) [68.206.124.231] Mail From: <[EMAIL PROTECTED]> 10:21 04:49 SMTPD(abb30d5300002931) [68.206.124.231] Rcpt To: <[EMAIL PROTECTED]> 10:21 04:49 SMTPD(abb30d5300002931) [x] looking up odryna.com in HOSTS 10:21 04:49 SMTPD(abb30d5300002931) [68.206.124.231] ERR jeep.lakespeed.com invalid user <[EMAIL PROTECTED] 10:21 04:49 SMTPD(abb30cec00002932) [10.0.90.23] connect 68.206.124.231 port 1277 10:21 04:49 SMTPD(abb30cec00002932) [68.206.124.231] HELO localhost 10:21 04:49 SMTPD(abb30cec00002932) [68.206.124.231] Mail From: <[EMAIL PROTECTED]> 10:21 04:49 SMTPD(abb30cec00002932) [68.206.124.231] Rcpt To: <[EMAIL PROTECTED]> 10:21 04:49 SMTPD(abb30cec00002932) [x] looking up odryna.com in HOSTS 10:21 04:49 SMTPD(abb30cec00002932) [68.206.124.231] ERR jeep.lakespeed.com invalid user <[EMAIL PROTECTED] 10:21 04:49 SMTPD(abb30d8100002934) [10.0.90.23] connect 68.206.124.231 port 1278 10:21 04:49 SMTPD(abb30d8100002934) [68.206.124.231] HELO localhost 10:21 04:49 SMTPD(abb30d8100002934) [68.206.124.231] Mail From: <[EMAIL PROTECTED]> 10:21 04:49 SMTPD(abb30d8100002934) [68.206.124.231] Rcpt To: <[EMAIL PROTECTED]> 10:21 04:49 SMTPD(abb30d8100002934) [x] looking up odryna.com in HOSTS 10:21 04:49 SMTPD(abb30d8100002934) [68.206.124.231] ERR jeep.lakespeed.com invalid user <[EMAIL PROTECTED] DNS Record for 68.206.124.231 68.206.124.231 PTR record: cpe-68-206-124-231.stx.res.rr.com. [TTL 3600s] [A=68.206.124.231] Mike -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Sanford Whiteman Sent: Friday, October 21, 2005 1:14 AM To: Mike Odryna Subject: Re[2]: [IMail Forum] Non-Deliverable Reports > No, I do not want to send them. And if I do I want to send them only > to the sending server not reply address. NDRs are sent to the envelope sender (MAIL FROM), not the header Reply-To. I don't have the slightest idea how you mean to send bounces "only to the sending server" and still have any utility. Sooner or later, those who fantasize about banning all outgoing or incoming bounces realize that this breaks SMTP as it is used in the real world. Better to not even start than to get caught with your pants down later. --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/rel ease/ Defuse Dictionary Attacks: Turn Exchange or IMail mailboxes into IMail Aliases! http://www.imprimia.com/products/software/freeutils/exchange2aliases/dow nload/release/ http://www.imprimia.com/products/software/freeutils/ldap2aliases/downloa d/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/ 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/
