Postfix + MySQL + Cyrus-sasl + Dovecot 配置邮件服务器时遇到的问题

Question

采用ostfix + MySQL + Cyrus-sasl + Dovecot 方式配置 postfix 邮件服务器后,测试时密码验证通不过,查询/var/log/maillog 日志如下:

Jul 22 15:27:51 mail postfix/smtpd[6067]: timeout after EHLO from jiangwei[10.37
.3.106]
Jul 22 15:27:51 mail postfix/smtpd[6067]: disconnect from jiangwei[10.37.3.106]
Jul 22 15:30:06 mail postfix/smtpd[6080]: warning: dict_nis_init: NIS domain nam
e not set - NIS lookups disabled
Jul 22 15:30:06 mail postfix/smtpd[6080]: connect from jiangwei[10.37.3.106]
Jul 22 15:30:06 mail postfix/smtpd[6080]: NOQUEUE: reject: RCPT from jiangwei[10
.37.3.106]: 504 <sdhhjiangwei>: Helo command rejected: need fully-qualified host
name; from=<lbt@nclsd.com> to=<jiangwei@nclsd.com> proto=SMTP helo=<sdhhjiangwei
>
Jul 22 15:30:06 mail postfix/smtpd[6080]: disconnect from jiangwei[10.37.3.106]

请问问题是出在什么地方?