Re: Backscatter solutions
; Marc Grober wrote: ; I am getting pounded by backscatter as a result of one of my addresses ; being used by some major spammers. Are there any solutions available to ; address all the Delivery failure and bounce notices. I would at least ; like to be able to sort between such responses from mail I am actually ; sending and the backscatter. I have looked through headers and nothing ; seems an obvious candidate. Pretty much the only way to stop this is to use something like BATV to tweak your envelope sender address outbound. That still doesn't stop everything as out-of-office replies are usually sent from a real address. http://tools.ietf.org/html/draft-levine-mass-batv-02 http://sourceforge.net/projects/batv-milter/ A. Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
Re: Backscatter solutions
--On 8 May 2008 17:38:18 -0700 Scott Likens [EMAIL PROTECTED] wrote: I wish that was really true, However having a spammer recently using my domain and email address to spam viagra. SPF etc don't really work unless the receiver is using SPF checking. If you aren't using SPF, then you can't really complain about backscatter. If you deploy SPF, then you can expect a bit less backscatter, and you can encourage others to check your SPF records. -- Ian Eiloart IT Services, University of Sussex x3148 Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
Re: Backscatter solutions
On Fri, 9 May 2008, Andy Fiddaman wrote: From: Andy Fiddaman [EMAIL PROTECTED] Cc: info-cyrus@lists.andrew.cmu.edu Date: Fri, 9 May 2008 07:05:06 + (GMT) Subject: Re: Backscatter solutions ... Pretty much the only way to stop this is to use something like BATV to tweak your envelope sender address outbound. That still doesn't stop everything as out-of-office replies are usually sent from a real address. http://tools.ietf.org/html/draft-levine-mass-batv-02 http://sourceforge.net/projects/batv-milter/ See: http://www.exim.org/exim-html-current/doc/html/spec_html/ch40.html#SECTverifyPRVS for details of how to implement BATV using exim. -- Dennis Davis, BUCS, University of Bath, Bath, BA2 7AY, UK [EMAIL PROTECTED] Phone: +44 1225 386101 Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
Re: Backscatter solutions
On May 9, 2008, at 3:05 AM, Andy Fiddaman wrote: Pretty much the only way to stop this is to use something like BATV to tweak your envelope sender address outbound. That still doesn't stop everything as out-of-office replies are usually sent from a real address. BATV changes the from address of outbound messages. How well do mailing lists deal with users that send messages from a different address each time? Is there a nice workaround for this? Cheers, Mike Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
Re: Backscatter solutions
On Fri, 9 May 2008, Mike Cathey wrote: ; On May 9, 2008, at 3:05 AM, Andy Fiddaman wrote: ; Pretty much the only way to stop this is to use something like BATV to ; tweak your envelope sender address outbound. That still doesn't stop ; everything as out-of-office replies are usually sent from a real address. ; ; BATV changes the from address of outbound messages. How well do mailing lists ; deal with users that send messages from a different address each time? Is ; there a nice workaround for this? It only changes the envelope address, leaving the From: message header intact. In my experience mailing lists validate the From: header not the return path so no problems. I haven't found any problems in the past year I've been using it. HTH. A. Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
Re: Backscatter solutions
Ian Eiloart [EMAIL PROTECTED] wrote: If you aren't using SPF, then you can't really complain about backscatter. Forget SPF. Why should any system accept mail for an unknown recipient and then mail a bounce? That's the primary cause of backscatter. These systems are just as likely to accept the message, then check SPF, and mail a bounce :-) This is getting off topic for the Cyrus list though. The question relevant to Cyrus, I thought, was whether a sieve filter can catch backscatter. With header-only tests, not so much. Joseph Brennan Lead Email Systems Engineer Columbia University Information Technology Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
Re: Backscatter solutions
We're looking at this as a solution: http://www.snertsoft.com/sendmail/milter-null/ Karl -- Karl Boyken, system administrator [EMAIL PROTECTED] 303A MLH, Dept. of Comp. Sci. http://www.cs.uiowa.edu/~boyken/ The U. of Iowa, Iowa City, IA 52242 319-335-2730 (voice) 319-335-3668 (fax) smime.p7s Description: S/MIME Cryptographic Signature Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
