[Mimedefang] SPF Usefulness (was Re: SNARE spam detection)

[David F. Skoll]

Steffen Kaiser wrote:

> However, it is possible to notify end-users about this case. Once I
> placed the MAIL FROM into the subject, if the addresses differ, but this
> caused lots of grief with mailing lists.

> I wonder why so few MUAs show a notice, when Return-Path and From
> differs. - - Actually I remember this only on Webmail.

Take a look at this e-mail.  It's extremely common for Return-Path
and From: to differ.

Regards,

David.