On 13 Dec 2022, at 17:00, Michael Thomas wrote:

> Which brings up a question: even though they pass on DKIM they should fail on 
> SPF, right? For transactional email that seems like a big old red flag, right?

Some people use receive-side forwarders (e.g., college alumni addresses) to 
have a consistent email address if they change ISP. That will, completely 
legitimately, cause SPF failures on transactional email.

-Jim

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