It is a known bug in mailing lists with bounce processing.

Because they can't differentiate between a soft and hard bounce, basically they 
consider that there is no user at the email address when they get too many 
bounces.

Take mailman, if your email address generate at least a bounce every day for 
five days, you get automatically unsubscribed. It does not matter if some 
emails got delivered to you...

PS: mailman 2.1.16 and up have an experimental DMARC setting to be in 
conformance with DMARC and a patch to reject emails from DMARC domains. Options 
both ways, now we will see what free market do.

On Dec 20, 2013, at 12:03 PM, Mason Schmitt <[email protected]> wrote:

> I don't follow your logic John. Why would the DMARC policy of one domain 
> affect the health of the mailing list for subscribers from other domains?  I 
> would think the only issue would be for users on the domain with the 
> published dmarc policy?
> 
> --
> Mason
> 

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