Hi!

> > Is it possible that gmail finds the <> envelope-from cheesy and
> > choose to reject ?
> 
> No. If you use MAIL FROM: <>, the SPF doesn't work for MAIL FROM.
> 
> It will use the SPF (TXT) record for the domain name of the sending
> SMTP server.

Ah, oh!

> If that mail gets out by mail.example.org, mail.example.org will be
> used for SPF, so TXT record for mail.example.org will be checked. Make
> sure all outgoing SMTP servers have SPF TXT records for their domains.

Changed, tested, works. Thanks very much, this is a very special corner
case -- that it will look up the SPF record for the rerverse DNS hostname
was surprising.

-- 
p...@opsec.eu            +49 171 3101372                    Now what ?
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