[Mailman-Users] Avoiding DMARC unsubscribes by enabling VERP_PROBES

[Peter Shute]

Why isn't this the default setting? Is there some disadvantage to it?

Peter Shute

Sent from my iPad

> On 18 May 2014, at 11:19 am, "Mark Sapiro" <mark at msapiro.net> wrote:
> 
> A post in another thread reminded me of something I had overlooked until
> now.
> 
> If you are a site admin and you are only concerned about users being
> unsubscribed because of DMARC policy bounces, and you are not concerned
> about the mail delivery issues - i.e., it's OK if they miss the
> occasional post from a Yahoo or AOL user; someone else will quote it
> anyway ;) - you can set
> 
> VERP_PROBES = Yes
> 
> in mm_cg.py. I added a note about this to the FAQ at
> <http://wiki.list.org/x/ggARAQ>
> 
> This works because with VERP_PROBES enabled, a user whose bounce score
> reaches threshold does not have delivery immediately disabled. Instead,
> the user's bounce score is reset and a VERP like probe is sent to the
> user. If the probe bounces, the user's delivery is then disabled, but if
> the original bounces were for DMARC, the probe won't bounce because it
> is From: the list.
> 
> -- 
> 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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