SingleEmailMessage の setOrgWideEmailAddressId(ID) インスタンスメソッドを使用できます。これを実行するには、まず [設定]| [メール] | [組織のアドレス] に移動し、組織全体のデフォルトメールアドレスを設定する必要があります。 その後、そのメールアドレスの ID を取得してインスタンスメソッドで使用します。
OrgWideEmailAddress[] owea = [select Id from OrgWideEmailAddress where Address = 'example@example.com'];
Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
if ( owea.size() > 0 ) {
mail.setOrgWideEmailAddressId(owea.get(0).Id);
}
参照資料: SingleEmailMessage メソッド
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