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

2009-11-16 Thread Hannes Erven
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

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

2009-11-16 Thread Wietse Venema
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 address

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

2009-11-16 Thread 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 .forward files? For list man

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

2009-11-16 Thread Wietse Venema
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 -- >

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

2009-11-16 Thread Jaroslaw Grzabel
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.

2009-11-16 Thread tobi
Jaroslaw Grzabel schrieb: > Jim Lang pisze: >> John Peach wrote: >>> On Mon, 16 Nov 2009 13:07:05 -0700 >>> Jim Lang wrote: >>> >>> John Peach wrote: > On Mon, 16 Nov 2009 13:00:26 -0700 > Jim Lang wrote: > > >> Wietse Venema wrote: >>

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

2009-11-16 Thread Jaroslaw Grzabel
Jim Lang pisze: John Peach wrote: On Mon, 16 Nov 2009 13:07:05 -0700 Jim Lang wrote: John Peach wrote: On Mon, 16 Nov 2009 13:00:26 -0700 Jim Lang wrote: Wietse Venema wrote: Jim Lang: OK here is the scenario. Spammer sends mail to: u...@mycl

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

2009-11-16 Thread Jim Lang
John Peach wrote: On Mon, 16 Nov 2009 13:07:05 -0700 Jim Lang wrote: John Peach wrote: On Mon, 16 Nov 2009 13:00:26 -0700 Jim Lang wrote: Wietse Venema wrote: Jim Lang: OK here is the scenario. Spammer sends mail to: u...@myclients

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

2009-11-16 Thread Jim Lang
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 problem

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

2009-11-16 Thread John Peach
On Mon, 16 Nov 2009 13:07:05 -0700 Jim Lang wrote: > John Peach wrote: > > On Mon, 16 Nov 2009 13:00:26 -0700 > > Jim Lang wrote: > > > > > >> Wietse Venema wrote: > >> > >>> Jim Lang: > >>> > >>> > OK here is the scenario. > > Spammer sends mail to: u...@mycl

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

2009-11-16 Thread Victor Duchovni
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

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

2009-11-16 Thread Jim Lang
John Peach wrote: On Mon, 16 Nov 2009 13:00:26 -0700 Jim Lang 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, no

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

2009-11-16 Thread John Peach
On Mon, 16 Nov 2009 13:00:26 -0700 Jim Lang 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, no

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

2009-11-16 Thread Jim Lang
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 connec

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

2009-11-16 Thread Wietse Venema
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. > > Bu