Backscatter being generated from mail aliased to other servers.

OK here is the scenario. Spammer sends mail to: u...@myclientsdomain.com from forged address vic...@randomdomain.com If u...@myclientsdomain.com is delivered locally, not a problem, if the address is invalid, postix rejects the mail during the smtp connection. But if

Re: Backscatter being generated from mail aliased to other servers.

Jim Lang: OK here is the scenario. Spammer sends mail to: u...@myclientsdomain.com from forged address vic...@randomdomain.com If u...@myclientsdomain.com is delivered locally, not a problem, if the address is invalid, postix rejects the mail during the smtp connection. But if

Re: Backscatter being generated from mail aliased to other servers.

Wietse Venema wrote: Jim Lang: OK here is the scenario. Spammer sends mail to: u...@myclientsdomain.com from forged address vic...@randomdomain.com If u...@myclientsdomain.com is delivered locally, not a problem, if the address is invalid, postix rejects the mail during the smtp

Re: Backscatter being generated from mail aliased to other servers.

On Mon, 16 Nov 2009 13:00:26 -0700 Jim Lang post...@guscreek.com wrote: Wietse Venema wrote: Jim Lang: OK here is the scenario. Spammer sends mail to: u...@myclientsdomain.com from forged address vic...@randomdomain.com If u...@myclientsdomain.com is delivered locally, not

Re: Backscatter being generated from mail aliased to other servers.

John Peach wrote: On Mon, 16 Nov 2009 13:00:26 -0700 Jim Lang post...@guscreek.com wrote: Wietse Venema wrote: Jim Lang: OK here is the scenario. Spammer sends mail to: u...@myclientsdomain.com from forged address vic...@randomdomain.com If u...@myclientsdomain.com is

Backscatter being generated from mail aliased to other servers.

Jim Lang put forth on 11/16/2009 2:00 PM: Wietse Venema wrote: Jim Lang: OK here is the scenario. Spammer sends mail to: u...@myclientsdomain.com from forged address vic...@randomdomain.com If u...@myclientsdomain.com is delivered locally, not a problem, if the address is invalid,

Re: Backscatter being generated from mail aliased to other servers.

On Mon, Nov 16, 2009 at 12:53:14PM -0700, Jim Lang wrote: OK here is the scenario. Spammer sends mail to: u...@myclientsdomain.com from forged address vic...@randomdomain.com If u...@myclientsdomain.com is delivered locally, not a problem, if the address is invalid, postix rejects the

Re: Backscatter being generated from mail aliased to other servers.

On Mon, 16 Nov 2009 13:07:05 -0700 Jim Lang post...@guscreek.com wrote: John Peach wrote: On Mon, 16 Nov 2009 13:00:26 -0700 Jim Lang post...@guscreek.com wrote: Wietse Venema wrote: Jim Lang: OK here is the scenario. Spammer sends mail to:

Re: Backscatter being generated from mail aliased to other servers.

Stan Hoeppner wrote: Jim Lang put forth on 11/16/2009 2:00 PM: Wietse Venema wrote: Jim Lang: OK here is the scenario. Spammer sends mail to: u...@myclientsdomain.com from forged address vic...@randomdomain.com If u...@myclientsdomain.com is delivered locally, not a

Re: Backscatter being generated from mail aliased to other servers.

John Peach wrote: On Mon, 16 Nov 2009 13:07:05 -0700 Jim Lang post...@guscreek.com wrote: John Peach wrote: On Mon, 16 Nov 2009 13:00:26 -0700 Jim Lang post...@guscreek.com wrote: Wietse Venema wrote: Jim Lang: OK here is the scenario.

Re: Backscatter being generated from mail aliased to other servers.

Jim Lang pisze: John Peach wrote: On Mon, 16 Nov 2009 13:07:05 -0700 Jim Lang post...@guscreek.com wrote: John Peach wrote: On Mon, 16 Nov 2009 13:00:26 -0700 Jim Lang post...@guscreek.com wrote: Wietse Venema wrote: Jim Lang: OK here is the

Re: Backscatter being generated from mail aliased to other servers.

Jaroslaw Grzabel schrieb: Jim Lang pisze: John Peach wrote: On Mon, 16 Nov 2009 13:07:05 -0700 Jim Lang post...@guscreek.com wrote: John Peach wrote: On Mon, 16 Nov 2009 13:00:26 -0700 Jim Lang post...@guscreek.com wrote: Wietse Venema wrote: Jim Lang:

Re: Backscatter being generated from mail aliased to other servers.

This page (http://www.postfix.org/ADDRESS_VERIFICATION_README.html) looks like it describes part of your problem. Could be the solution Regards tobi I had had a lot of troubles with verification database. For example... new customer is added to SMTP relay, changed MX record to point my

Re: Backscatter being generated from mail aliased to other servers.

Jim Lang: But if mycli...@otherserver.com can for whatever reason not be delivered, otherserver.com does what it is supposed to do and rejects the mail during the smtp connection, which causes postfix to send out a non-delivery report to vic...@randomdomain.com -- backscatter. Is

Re: Backscatter being generated from mail aliased to other servers.

Wietse Venema wrote: Recipient verification does not expand a local alias (imagine what would have to be done to verify with addresses in .forward files, or in a mail distribution list). Maybe I'm dense, but what would be the problem with verifying addresses in .forward files? For list

Re: Backscatter being generated from mail aliased to other servers.

Miles Fidelman: Wietse Venema wrote: Recipient verification does not expand a local alias (imagine what would have to be done to verify with addresses in .forward files, or in a mail distribution list). Maybe I'm dense, but what would be the problem with verifying addresses in

Re: Backscatter being generated from mail aliased to other servers.

Folks, it seems to me that there has been some misunderstanding of Jim's setup and situation. Clearly, you are *NOT* doing recipient verification, or myotherserver.com would not be rejecting it. Never accept mail which cannot be delivered. What he describes is that the final destination -