fastmail / authentication_milter

Email Authentication by SPF/DKIM/DMARC etc.

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When using ARC no Authentication-Results headers should be created

gizahNL opened this issue · comments

The spec states that these headers should not be added, as they're likely to be removed by downstream MTA's.

I might've missed something, but I could not find any documented way of preventing the generation of these headers.

Hi, If I understand correctly, you want to generate the ARC-Authentication-Results header but not the Authentication-Results header?
No, it's currently not possible to do this as the ARC sealing code uses the added Authentication-Results to generate it's ARC Seal and associated AAR headers.