ThunderBirde で、開封メッセージ付きのメールを作成し自分宛てに送信、ThunderBirdeで開封メッセージを送信し 開封してみました。 his is a Return Receipt for the mail that you sent to ○○○○○○＠○○．ｎｅ．ｊｐ ←アドレス Note: This Return Receipt only acknowledges that the message was displayed on the recipient's computer. There is no guarantee that the recipient has read or understood the message contents. ---------------------------------------------------------------------------------------------------- Reporting-UA: Mozilla/5.0 (Windows; U; Windows NT 5.1; ja; rv:1.8.1.23) Gecko/20090812 Thunderbird/2.0.0.23 Final-Recipient: rfc822; ○○○○○○＠○○．ｎｅ．ｊｐ Original-Message-ID: < ○○○○○○＠○○．ｎｅ．ｊｐ> Disposition: manual-action/MDN-sent-manually; displayed ---------------------------------------------------------------------------------------------------- さらに英文が100行くらい有り添付ファイルが2通です。
