On 27 Jul 2004 at 11:28, Chris Haynes wrote:
If all SPF rejections take place during the SMTP process, and all explanation
messages are carried in 5** responses then, if only 'good guys' are involved,
the sending MTA (i.e. the one receiving the 5** explanation) will be under the
same administrative control as the domain which published the explanation.
What if a "good sender" (i.e. an user of your domain) is traveling and
sends an email through a foreign provider's SMTP-Server, which you don't
allow in your SPF-policy. This is the case you want to catch with
your "explanation message", isn't it?
The foreign provider's SMTP-Server will possibly generate the bounce that
is send back to your user in your original domain with the error message.
You will have no easy access anymore to the original 5xx response, since
it will be embedded inside the MTA's bouce message.
Or not?
But even in this case, no standardization is needed if you stick to 7bit
ASCII, since this is really just something that the original sender will
have to read.
--
Ernesto Baschny <ernst(_at_)baschny(_dot_)de>
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