please check it.
--------------------------------------------
2014/05/28-09:27:34 5504 开始递送,递送给外部邮箱 <contact@bitshares.org>
2014/05/28-09:27:41 5504 递送给远程主机 74.125.25.26
2014/05/28-09:27:42 5504 [<--]: 220 mx.google.com ESMTP gz4si21448123pac.61 - gsmtp
2014/05/28-09:27:42 5504 [-->]: HELO mail.xxx.net
2014/05/28-09:27:42 5504 [<--]: 250 mx.google.com at your service
2014/05/28-09:27:43 5504 [-->]: MAIL FROM: <xxx@xxx.net>
2014/05/28-09:27:43 5504 [<--]: 250 2.1.0 OK gz4si21448123pac.61 - gsmtp
2014/05/28-09:27:43 5504 [-->]: RCPT TO: <contact@bitshares.org>
2014/05/28-09:27:43 5504 [<--]: 550-5.1.1 The email account that you tried to reach does not exist. Please try
550-5.1.1 double-checking the recipient's email address for typos or
550-5.1.1 unnecessary spaces. Learn more at
550 5.1.1
http://support.google.com/mail/bin/answer.py?answer=6596 gz4si21448123pac.61 - gsmtp
2014/05/28-09:27:43 5504 [-->]: QUIT
2014/05/28-09:27:43 5504 递送失败:<contact@bitshares.org>,远程主机(74.125.25.26): remote server said: 550-5.1.1 The email account that you tried to reach does not exist. Please try
550-5.1.1 double-checking the recipient's email address for typos or
550-5.1.1 unnecessary spaces. Learn more at
550 5.1.1
http://support.google.com/mail/bin/answer.py?answer=6596 gz4si21448123pac.61 - gsmtp