zohoからの自動メールについて

zohoからの自動メールにおいてちょっと困ったことが起こっており、サポートにも相談中なのですが

ほかの方にも同現象が発生していないか相談したい。

▼事象

zohoからの自動メールにおいて時折「このメールが送信者からのものであると確認できないため、このメールに安全に返信できない可能性があります」とメーラーから警告が出る。

▼状況

発信元：設定した独自ドメイン

SPF/DKIM設定：済

利用メーラー：outlook

発生頻度：稀（連続するときもあるが、パタッとでなくなる時もある）

サポートへの連絡：ただいま継続相談中

失敗したメールヘッダを調べるとSPFはPass、DKIM認証がfail、それに伴いDMARCもfailとなっています。

ちなみにヘッダをCopilotで解析した結果は以下の通り。

• DKIM失敗：署名はあるが、公開鍵がDNSに存在しないため検証できません。
• DMARC失敗：FromドメインとSPF/DKIMの整合性が取れていないため、DMARCポリシーにより「fail」と判定。

SPFがPassしているせいかspamフォルダには入ってないですが、今後メール判定の厳格化が進めば

spamフォルダ入りになる可能性もあり、原因を調べています。

発生条件を調べているのですが、なかなか原因がわからず。

送信元メールサーバーのIPを調べても、同一IPからでも発生する場合、しない場合に分かれていて

お手上げの状態です。zoho利用者に同様の現象が起きている人はいないでしょうか。

※便利上Formsのカテゴリを選択していますが、CRMなどからの自動メールでも時々起こります。

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