服务器需要STARTTLS。如果我使用telnet进行手动SMTP会话,则会得到以下信息:
220 BLU0-SMTP122.phx.gbl Microsoft ESMTP MAIL Service, Version: 6.0.3790.4675 ready at Mon, 18 Jul 2011 17:08:14 -0700
HELO jhmg.net
250 BLU0-SMTP122.phx.gbl Hello [70.123.155.64]
MAIL FROM:<zzz@zzz.com>
530 5.7.0 Must issue a STARTTLS command first
该服务器不接受未加密的连接