Forwarded to devs SPF_FAIL for internally forwarded emails

[RPD]

@Kaspar Thank you very much. Finally, the developers could reproduce the bug and confirmed its existence. I'm looking forward to the fix.

 

[IgorG]

Thank you. The bug PPPM-13801 has been confirmed and submitted.

 

[websavers]

Noticed this occurring recently since we bumped up the SPF_FAIL score. What's odd to me is that the mail server still records the Received-SPF header as a pass, yet Spamassassin apparently ignores this for its scoring. This is odd because `ignore_received_spf_header` is 0 and `use_newest_received_spf_header` is 0 by default. This would imply that it should be using the existing header, and yet it's not.