ezmlm: Yahoo's DMARC policy and ezmlm


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Subject: Re: Yahoo's DMARC policy and ezmlm
From: Brian Behlendorf ####@####.####
Date: 2 May 2014 14:53:40 -0000
Message-Id: <alpine.DEB.2.10.1405020749100.3079@laz>

On Fri, 2 May 2014, Brian Behlendorf wrote:
> On Fri, 2 May 2014, Charlie Brady wrote:
>> No. I have a list which is probing and unsubscribing various non-yahoo
>> subscribers because of the yahoo dmarc change. That list has none of
>> prefix, text/trailer and addtrailer.
>
> Drat.  Are there any other DKIM-breaking transformations on messages that 
> ezmlm could be doing?

Also, why would a *probe* fail to users due to DMARC?  The probe message 
doesn't come with a "From: ####@####.#### address, so the probe message 
itself shouldn't bounce.  In fact the symptom of this problem is that 
users at gmail.com and other sites that check DMARC get the probe 
messages, which explain that messages to them are bouncing, confusing 
them; but since the probe message was successfully delivered, they aren't 
unsub'd.

It's worse on Mailman, which after 5 bounces will remove an address, no 
probe sent (yet another example of DJB's forethought on bounce handling!). 
This meant that the 5th message from a @yahoo.com user on some Mailman 
lists that friends of mine run resulted in mass unsubscribes of users at 
gmail.com, hotmail.com, etc.

Brian

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