Gmail転送時に「550-5.7.26」エラーがでる。

 Gmail転送時に以下のようなメッセージが出る。

This is the mail system at host relay01.poa.svr4u.net.

I'm sorry to have to inform you that your message could not

be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can

delete your own text from the attached returned message.

                   The mail system

<XXXX@gmail.com>: host gmail-smtp-in.l.google.com[111.111.111.11] said:

    550-5.7.26 This message does not pass authentication checks (SPF and DKIM

    both 550-5.7.26 do not pass). SPF check for [luarida-works.com] does not

    pass with 550-5.7.26 ip: [111.111.111.11].To best protect our users from

    spam, the 550-5.7.26 message has been blocked. Please visit 550-5.7.26

    https://support.google.com/mail/answer/81126#authentication for more 550

    5.7.26 information. 22-20020a630316000000b0047009d37d4fsi18178556pgd.755 -

    gsmtp (in reply to end of DATA command)

どうやら、転送元でのSPF(Sender Policy Framework)エラーらしいので、DNSの設定を変更する必要がある。

参考リンク：Gmailへ転送時に「550-5.7.26」エラーが返るならSPFの設定を！