Missing From Model

I was able to solve this for the time being making a copy of the Recipient model and renaming everything as From
You can also just use the Recipient model vs creating a whole new model but that kinda defeats the reason to have its own names makes it hard to understand why you would be using a Recipient model for a From function.
Example code of how it has been implemented.

    $rrrr = new Model\From();
    $rrrr->setEmailAddress(array('address' => $from_mailbox));
    $message->setFrom(($rrrr));

This ensures the from address is set correctly and the email will send.

まず既存の Recipient モデルと、issue で提案されている Model\From の使用方法を比較し、次に setFrom と setEmailAddress がこれらのモデルオブジェクトをどのように扱うかを確認します。From モデルで送信者アドレスを正しく設定でき、メールが期待どおりに送信されれば完了です。