[Hidden-tech] AOL.COM emails have become problematic

[Charles Strader (Gaia Host)]

Yeah, Yahoo has been doing this DMARC denial for a while, it is
problematic for listservs especially, but also things like emails
generated by web site contact forms depending on how they are setup to send.

One work-around is the mitigation of changing the FROM: header and
adding a Reply-To: header.  That way replying to the list message could
still go back to the originally sender, but DMARC won't block because
the FROM: doesn't result in a match.  The From: header could even show
the aol/yahoo email address in "Name" part of that header and still get
past dmarc blocks... Yahoo listservs follow that style themselves.

Example:

From: "useremail at aol.com [hidden-tech]"
<hidden-discuss at lists.hidden-tech.net>
Reply-To: useremail at aol.com

Charles Strader
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Worker-Owner at Gaia Host Collective
http://gaiahost.coop
For General Support: support at gaiahost.coop or phone x0


On 4/26/15 11:49 PM, R. David Murray wrote:
>
>
> The problem is that the mailing list wants to re-send the message as
> 'from' the aol address, but with various bits of the message modified.
> DMARC disallows this.
>
> This is a known problem and has been for quite some time with Yahoo at
> least.  There are various articles about it.  Mailman (the most popular
> mailing list software) has some mitigations for it that the list owner
> can select, but I don't think any of them are perfect.  I know of
> at least one site that just rewrites the from address so that it
> is no longer a yahoo address (xyz at yahoo.com.dmarc-invalid), which
> at least allows the message to be delivered.  Also not a very
> good solution.
>
>