The mailing list for listmasters using Sympa

[Erik Olson <address@concealed>]

Hmm...maybe.  I suppose that having something resembling the original e-mail address is a little easier than having to chase down a hidden header (though the folks using the mailing lists I maintain will probably have trouble with either).

I wonder how many mailers are going to attempt to deliver to the .invalid address when someone hits reply?

Also, will this invalidate the use of DKIM and DMARC by the maling list itself?  I don't know enough about DKIM and how it's verified on the receiver to know which headers are checked against the domain selector in the DKIM signature itself.

  - Erik

On 2014-04-24 07:04, Steve Shipway wrote:

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 best way to munge the From header and avoid DMARC would be to change the email address to have the .invalid suffix, rather than change the From email address to be that of the list.

Thus --

From: Mr Test <address@concealed>

would be rewritten to be

From: Mr Test via Mailing List <address@concealed>

The .invalid GTLD is reserved for precisely this usage and will never become a valid email address.

Does anyone have any thoughts?  I might extend my patch (yet again) to give options for the email address to be changed in this way.

Steve

Steve Shipway
University of Auckland ITS
UNIX Systems Design Lead
address@concealed
Ph: +64 9 373 7599 ext 86487

--
Erik Olson
Proudly joining 21st Century e-mail in 2013