[Xapian-discuss] Administrivia: Problems caused by Yahoo addresses

[Olly Betts]

On Sat, Sep 12, 2015 at 08:28:41AM -0600, Rob Nagler wrote:
> Eric:
> > Fwiw, mailman has a 'cleanse-dkim' handler which strips DKIM-related
> > headers entirely.  Maybe that's enough to get mails through...
> 
> This is insufficient. You need to rewrite the From.

Indeed - Yahoo's "p=reject" means that an email apparently sent from
Yahoo but lacking a valid DKIM signature will be rejected by anyone
who honours "p=reject".  So stripping the DKIM headers is no help unless
you also change the "From:" header.

> Looks like Mailman has this feature now:
> 
> http://wiki.list.org/DEV/DMARC
> 
> Olly, you'll need to upgrade to  2.1.16 to be able to turn this on.

I don't think rewriting "From:" is a good idea at all.  

> It was relatively easy for us to rewrite the header so that's what we did.
> AOL has similar problems, btw.

AOL is pretty much irrelevant for us though - it just isn't at all
popular with our community.  In fact there currently isn't a single
subscriber to xapian-discuss or xapian-devel using AOL, but e.g. 18
using various yahoo domains to xapian-discuss (c.f. 200 for
gmail+googlemail).

James has removed the subject tags from -discuss and -devel.  If you
were using those for filtering, I'd recommend switching to "List-Id"
instead.

There's still some content filtering (attachments, HTML email).  We
will monitor if these cause problems.

Cheers,
    Olly