I set up the following SPF record for the x-under.com domain:
v=spf1 ip4:22.214.171.124/16 ip4:126.96.36.199/16 ip4:188.8.131.52/17 ip4:184.108.40.206/18 ip4:220.127.116.11/17 include:spf-0.secureserver.net a mx ~all
However, such an entry does not pass verification in Gmail.com:
spf=none (google.com: p3plcpnl1034.prod.phx3.secureserver.net does not designate permitted sender hosts)
You are sending the mails with an envelope-from having “p3plcpnl1034.prod.phx3.secureserver.net” as domain.
Google tries to look for the SPF record of that domain, and doesn’t find one.
It’s not clear at all what role x-under.com plays here. Maybe you are using it in your “From:” header, but this is not what SPF is about.
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