ubuntu + saslauthd 問題

[Q:] 某個帳號不能通過認證來寄信，查了mail.log如下
postfix/smtpd[8216]: warning: SASL authentication failure: cannot connect to saslauthd server: Permission denied
postfix/smtpd[8216]: warning: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx: SASL LOGIN authentication failed: generic failure

[A:] 把postfix 加入 sasl 群組即可
addgroup postfix sasl