[lug] Postfix/spam reality check question...

[Lee Woodworth]

Chip Atkinson wrote:
> Greetings,
> 
> Recently I installed postfix with SPF and postgrey greylisting.  Before I
> got greylisting going, it seemed that postfix was rejecting messages where
> the "From " was different from the "Helo" and "From:".
I don't think the From_ (From with trailing space) is an SMTP or MIME 
header. It's used in unix mailbox files to separate messages.
> 
> Is this the default/expected behavior for postfix with 
> smtpd_recipient_restrictions =
>     reject_unlisted_recipient
>     reject_unknown_sender_domain
>     reject_unauth_destination
 From man 5 postconf, reject_unlisted_recipient and 
reject_unauth_destination work against the RCPT TO command value. The 
reject_unknown_sender_domain restriction uses the MAIL FROM command 
value. Probably not the cause of the problem.

>     check_policy_service inet:127.0.0.1:10023
>     check_policy_service unix:private/spf
The spf service is sensitive to the EHLO/HELO and MAIL FROM command 
values. Looking at the SPF related whitepaper at spf.pobox.com, it looks 
like forwarded messages may be considered forgeries (since the 
forwarding server isn't the original MTA that is authorized to send mail 
for the MAIL FROM domain). Is it only forwarded mail that is improperly 
rejected?
> 
> in main.cf?
> 
> Oh, check_policy_service inet:127.0.0.1:10023 is the greylist server.
> 
> Thanks in advance.
> 
> Chip
> 
> 
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