[Mailman-Users] DMARC issues
Stephen J. Turnbull
stephen at xemacs.org
Thu Apr 10 19:57:48 CEST 2014
Siniša Burina writes:
> Basically, Yahoo insists that their own mail servers are the only
> ones that can originate the message with @yahoo.com domain in the
> From header. Not Return-Path, Not the envelope sender, but exactly
> the From header in the message itself. If this practice gets
> adopted by more organizations, I don't know how else could this
> problem be solved.
If yahoo wants to give their users an excuse to use a different
address and stop advertising yahoo, I have no problem with that. :-)
The straightforward thing for Mailman to do is to wrap mail from yahoo
addresses in a multipart/mixed with a text part explaining that Yahoo
is "knowingly interfering with" the mail service of their users, and
the mail itself in a message/rfc822 part. As far as I know, no
component of DMARC allows digging into a message and trying to DMARC
the MIME parts.
Or just bounce them with a message stating that Yahoo no longer
permits its users to post to mailing lists, so please use a different
posting address. I realize that most sites can't do that, but mine
can (and will if I get any complaints about this policy -- my
subscribers are sympathetic).
Steve
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