Re: Question abour SRS in sendmail

On Tue, 19 Jul 2005, David Woodhouse wrote:

> On Tue, 2005-07-19 at 11:37 -0400, Stuart D. Gathman wrote:
> > Some people use SRS only to block forged bounces - and SES could be
> > an alternative for that purpose.  But for forwarding mail and
> > any resulting bounces, SRS is what you need.
> 
> That or a baseball bat with which to educate the recipients who are
> rejecting your validly forwarded mail. :)

While correctly handling forwarders is the responsibility of 
the recipient when implementing strict SPF checking, SRS can
be a tool that simplifies forwarder management in many cases.

Without SRS, the recipient must keep a list of forwarder domains,
and essentially check a forwarder domain "as if" it was the MAIL FROM
(even though it isn't).  This is better than keeping a list of raw
IP addresses, but even simpler still, the recipient can choose
only forwarders who implement SRS.  Then they don't need to keep a list.
Of course, this only works if the recipient has that choice.

-- 
	      Stuart D. Gathman <[email protected]>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flamis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.