疎通確認用にtelnetで手打ちするときのメモ
220 rabi.en.rose.tls.org ESMTP Sendmail 8.9.3/3.7W; Sat, 4 Mar 2000 10:24:52 +0900 (JST) HELO petit.charat.tls.org. 250 rabi.en.rose.tls.org Hello petit.charat.tls.org [192.168.100.1], pleased to meet you QUIT 221 rabi.en.rose.tls.org closing connection