Salesforce のメールリレー機能では、メールサーバーを経由するかどうかをお客様側で制御はできません。特定の機能のメールは自動的にリレー対象となります。
メールリレーの対象となるメール、対象とならないメールは Salesforce で定められており、お客様側で制御することはできません。詳細は以下の通りです。
メールリレーの対象となるメールの例
メールリレー対象とならないメールの例
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