220 tk2-215-17389.vs.sakura.ne.jp ESMTP unknown 250-tk2-215-17389.vs.sakura.ne.jp 250-PIPELINING 250-SIZE 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN
220 tk2-215-17389.vs.sakura.ne.jp ESMTP unknown 250-tk2-215-17389.vs.sakura.ne.jp 250-PIPELINING 250-SIZE 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN