Centos 7 535 5.7.8错误：身份验证失败：通用失败

Question

我已经在Centos 7上配置了postfix服务，但是每次我尝试进行身份验证时，我都会遇到相同的错误，

  

535 5.7.8错误：身份验证失败：通用失败

这是telnet会话

EHLO localhost 
250-webserverlocaldomain.localdomain 
250-PIPELINING
250-SIZE 10240000 
250-VRFY 
250-ETRN 
250-AUTH PLAIN LOGIN
250-ENHANCEDSTATUSCODES 
250-8BITMIME 
250 DSN AUTH LOGIN 334
VXNlcm5hbWU6 
bWFpbGVy 
334 UGFzc3dvcmQ6 
Y29kZW5hbWVkMTU5 
535 5.7.8 Error: authentication failed: generic failure



This is my etc/postfix/master.cf file
# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (yes)   (never) (100)
# ==========================================================================
smtp      inet  n       -       n       -       -       smtpd
#smtp      inet  n       -       n       -       1       postscreen
#smtpd     pass  -       -       n       -       -       smtpd
#dnsblog   unix  -       -       n       -       0       dnsblog
#tlsproxy  unix  -       -       n       -       0       tlsproxy
submission inet n       -       n       -       -       smtpd
  -o syslog_name=postfix/submission
#  -o smtpd_tls_security_level=encrypt
  -o smtpd_sasl_auth_enable=yes

我已经尝试了所有方法，但仍然出现此错误。请帮忙。