[spambayes-dev] RE: Delivery Status Notification (Failure)

[Neil Schemenauer]

[Seth]
> I'm still curious why only a few of the list postings get 
> distributed with a VERP address and the rest don't.  Any idea on this?

It is a feature of Mailman.  It uses VERP so it can detect dead
addresses but doesn't always use it in order to conserve bandwidth.
How much bandwidth is saved is open for debate.  Mailman has an
option to enable VERP for every delivery.

  Neil