[Mailman-Users] Avoiding DMARC unsubscribes by enabling VERP_PROBES

Mark Sapiro mark at msapiro.net
Sun May 18 20:50:10 CEST 2014

On 05/18/2014 01:14 AM, Peter Shute wrote:
> Why isn't this the default setting? Is there some disadvantage to it?

In addition to what Stephen said, VERP_PROBES requires that your MTA be
configured to recognize address local parts of the form
listname-bounces+token and deliver them the same as listname-bounces (In
Postfix, 'recipient_delimiter = +') or to use a different delimiter that

Since we can't rely on that, and since if it doesn't work, no one will
ever have delivery disabled or be removed by bounce processing, the
default is No.

When this feature was first implemented in 2.1.5, it was always on. It
was soon realized that this was a mistake and in 2.1.6 it was controlled
by a switch and defaulted to off.

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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