Received-SPF:softfail(google.com:domain of transitioning user@example.com does notdesignate xxxx.xxxx.xxxx.xxxx aspermitted sender)client-ip=xxxx.xxxx.xxxx.xxxx;
Authentication-Results:mx.google.com;
spf=softfail(google.com:domain of transitioning user@example.com does notdesignate xxx.xxx.xxx.xxx aspermitted sender)smtp.mailfrom=user@example.com
設定後のメールヘッダ (SPF=PASS)。
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Received-SPF:pass(google.com:domain of transitioning user@example.com designates xxxx.xxxx.xxxx.xxxx aspermitted sender)client-ip=xxxx.xxxx.xxxx.xxxx;
Authentication-Results:mx.google.com;
spf=pass(google.com:domain of transitioning user@example.com designates xxx.xxx.xxx.xxx aspermitted sender)smtp.mailfrom=user@example.com