On Wed, Dec 11, 2013 at 23:21:19 +0100,
Florian Weimer <fw(a)deneb.enyo.de> wrote:
Doesn't matter, it's still a bug that increases the administrative
burden of running a mailing list.
It isn't a bug. It is a feature. (It makes it simple to confirm subscription.)
And mailman has a similar feature, and broken autoresponders can also
successfully complete its subscription process. Though they have to include
the message being replied to as well as responding to the incorrect address.)
Auto responders that respond to mail header addresses are broken and
will cause problems in other cases. (They should only be responding to
the envelope sender address and if the envelope sender address is empty,
they shouldn't be responding at all.)