Postfix 一直显示正在发送,日志报错warning: SASL: Conn?报错

在虚拟机配置了一个postfix，就是发送不了邮件，log报错如下：@红薯 @皮总 @逝水fox ,google一大片，各种解决不了，只能来求助大神了

Mar 15 17:19:03 mymail postfix/master[4938]: daemon started -- version 2.7.3, configuration /etc/postfix
Mar 15 17:20:27 mymail extmail[5156]: user=<maple@wajueji.net>, client=192.168.0.31, module=login, status=loginok
Mar 15 17:22:51 mymail postfix/smtpd[5348]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Mar 15 17:22:51 mymail postfix/smtpd[5348]: warning: TLS has been selected, but TLS support is not compiled in
Mar 15 17:22:51 mymail postfix/smtpd[5348]: connect from localhost.localdomain[127.0.0.1]
Mar 15 17:22:51 mymail postfix/smtpd[5348]: warning: SASL: Connect to /var/run/dovecot/auth-client failed: No such file or directory
Mar 15 17:22:51 mymail postfix/smtpd[5348]: fatal: no SASL authentication mechanisms
Mar 15 17:22:52 mymail postfix/master[4938]: warning: process /usr/libexec/postfix/smtpd pid 5348 exit status 1
Mar 15 17:22:52 mymail postfix/master[4938]: warning: /usr/libexec/postfix/smtpd: bad command startup -- throttling