我通过将此配置添加到main.cf以下内容将 Postfix 设置为 SMTP 服务器：
myhostname = foo.com
mydomain = foo.com
myorigin = $mydomain
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
smtpd_helo_required = yes
smtpd_helo_restrictions = reject_invalid_helo_hostname
smtpd_recipient_restrictions = reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
该sasl_passwd文件如下所示：
foo.com user:pass
我已经sasl_passwd.db从那个文件中生成了一个。不幸的是，当使用用户名和密码连接到我的服务器时，我不断遇到身份验证失败。我究竟做错了什么？