送信者と受信者が同じドメインで Outlook (Exchange Online) を使用し、Direct Send が無効な場合、Salesforce からのメールが拒否されます。
送信者にバウンス通知が届くか、メールログにエラー「550 5.7.68 TenantInboundAttribution; Direct Send not allowed for this organization from authorized sources」が記録されます。
これは Salesforce の問題ではありません。
Exchange の Direct Send 機能により、Salesforce が未承認の送信元として扱われているため、メールが拒否されています。
解決するには、社内の IT 部門および Microsoft サポートチームに連絡し、Office 365 の設定を確認して変更してください。
関連する Microsoft の資料:Direct Send
005133045

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