The mailing list for listmasters using Sympa

[Miles Fidelman <address@concealed>]

Matt Taggart wrote:
> Steve Shipway writes:
> > After reading the Wikipedia DMARC entry at http://en.wikipedia.org/wiki/DMARC
> >   and RFC2606 http://tools.ietf.org/html/rfc2606 , it seems to me that the bes
> > t way to munge the From header and avoid DMARC would be to change the email a
> > ddress to have the .invalid suffix, rather than change the From email address
> >   to be that of the list.
<snip>
> > Does anyone have any thoughts?  I might extend my patch (yet again) to give o
> > ptions for the email address to be changed in this way.
>
> Some things I have been thinking about
>
> 1) what about a "de-munger" to make list replies work. Something like
>
>    J. R. Hacker <address@concealed>
> to
>    J. R. Hacker via listname <address@concealed>
>
> and have dmarc.example.com demunge the address and deliver the mail. It
> would need to be protected somehow to prevent being used as a remailer
> (maybe it could look for something in the reply headers?) or for sending
> spam.
>
> 2) Maybe just rewrite them all to a single address that is just configured
> to reply with a notice saying "due to the DMARC policy of the domain of the
Re. both thoughts:

1. There's been some discussion of this sort of thing on 
address@concealed - including some discussion on experience with 
adding .invalid - might be worth going through the archives, and maybe 
posting the specific question there

2. Re. what mailers actually do vs. what the RFCs say they should do: 
might be worth asking that on, at least, the sendmail, postfix, and exim 
lists

3. "de-munging" - that's a great idea!  But... it sure would be easier 
if there were a bit of standardization as to what kinds of de-munging a 
mail client, or procmail script should do -- probably worth joining the 
discussion -- which seems to be happening across the dmarc-discuss, 
address@concealed and address@concealed lists

Miles Fidelman



--
In theory, there is no difference between theory and practice.
In practice, there is.   .... Yogi Berra