[Mailman-Users] Emails from yahoo members, are getting rejected by yahoo, "Service Unavailable".

Mark Sapiro mark at msapiro.net
Tue Apr 15 04:16:06 CEST 2014

On 04/14/2014 12:16 PM, Lindsay Haisley wrote:

> This is confusing.  I have a list using the DN autoharp.org.  the
> envelope sender is a VERP address with the recipient address embedded,
> but the DN is autoharp.org, which passes SPF based on the A record for
> it.  The From header address is, of course, that of the author as per
> RFC.
> But we lost perhaps 10% of subscribers to the list based on DMARC
> rejection.

Yes, your SPF is valid, but the domain of the envelope sender
(autoharp.org) which is what the SPF deals with does not 'align with'
(DMARC standard words) the domain of the From: (yahoo.com). Thus your
SPF says your server is allowed to send mail with envelope from
autoharp.org, not yahoo.com, so it doesn't count for DMARC validation of
mail From: yahoo.com.

Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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