Originally Posted by
rsteinmetz70112
I have found that google enforces IPv6 rules rather strictly and that can cause all sorts of erratic issues depending on the server you use, the client you use and your ISP.
On many mail clients simply adding a contact for the sending address will prevent mail from being identified as spam or junk.
The above may be true, but in this case the problem seems to be that even though the email passes SPF (the first header line quoted) it is failing DMARC due to an "alignment check" (the second header line) -- i.e. the domain of the actual sender (amadeus.com) does not match the domain in the "From" header (southwest.com).
This is a solvable problem, but will need some action from Southwest IT in conjunction with Amadeus.