FYI:
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// From the release notes:
4.2b6 19-Jun-04
* SMTP: the SPF Verification functionality has been added.
// From the manual:
Use SPF
This option tells the SMTP module if it has to verify the Return-Path
domain name using the SPF DNS records.
If this option is set to Disabled, the SPF records are not used.
If this option is set to Enabled, the SPF records are checked. If
these records say that messages with the specified Return-Path domain
cannot be sent from the senders network (IP) address, the Return-Path
is rejected (if the SPF records specify "hard failure" for that
address), or the message is accepted, but the specified Header Field
is added to the message (if the SPF records specify "soft failure").
If this option is set to Add Header, the SPF records are checked, and
the specified Header Field is added to the message if the retrieved
SPF records specify "hard failure" or "soft failure".
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j o a r