开云体育

Larry,

Just look at the first Received Header, and compare its source to
whether it succeeded or failed. This essentially duplicates Lena's
efforts, right?

Sort-of.

Gmail inserts other fields in the message header that detail its results for the various authentication methods used with the incoming message. Things like whether SPF was valid, DKIM valid, DMARC disposition. It may also indicate if a sender failed a reverse lookup, or maybe Gmail would have rejected the message too, I don't really know (yet).

But either way, that's information too.

Shal



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