なんらかの理由で受信メールサーバが到達不能な場合、Salesforce は 24 時間で再送信を試みます。
時間の経過とともに再実行の間隔は増加します。間隔は、受信メールサーバおよびメール キューへの接続に基づいているためあくまでも目安となりますが、以下のとおりです。
Salesforce のメール再配信の試行スケジュール
000385127

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