Spamhaus ブラックリスト確認
https://www.spamhaus.org/lookup/

テンプレート

Please cancel the blacklist of <●IPアドレス>
It seems that there has been no unauthorized relaying, so I believe that it has not been registered by mistake.

Please cancel it,
If you have any problems, please let us know if you have any problems.

Thanking you in advance.

<●署名>