[db-wg] 96.0.0.0/20

> i found the problem

> the mail is being sent as
>     From MAILER-DAEMON Thu Nov 16 18:01:47 2006
>     Return-path: <>
> you should not be doing this!  that is reserved for mail delivery
> failures.

Well....

There are other classes of messages, such as delivery *success*
notifications, for which <> is specced as appropriate; see RFC2821
4.5.5 and (eg) RFC2298 or RFC4356.  Even for other mail, though, it's
only a SHOULD - and there are other cases where <> is specifically
called out as appropriate.  For example, see RFC3464 4.2 item (d).

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