尽管 mySQL 身份验证配置看似有效，但 Postfix 仍返回“无 SASL 身份验证机制”

Question

我正在尝试使用 Postfix+Dovecot+mySQL 设置具有多域支持的邮件服务器。我正在遵循本指南。

我似乎已经设置好一切，服务器正在发送 dovecot SSL 证书（在我的客户端中抛出一个证书异常对话框），但是邮件没有发送或接收。

/var/log/mail_err 返回此后缀错误：

连接到私有/身份验证失败：连接被拒绝

/var/log/mail.log 返回更多细节：

Sep 25 19:33:58 localhost postfix/postscreen[11483]: CONNECT from [MYIPADDRESS]:58837 to [MYSERVERIPADDRESS]:25
Sep 25 19:33:58 localhost postfix/postscreen[11483]: PASS OLD [MYIPADDRESS]:58837
Sep 25 19:34:01 localhost postfix/smtpd[11486]: connect from MYHOSTMASK[MYIPADDRESS]
Sep 25 19:34:01 localhost postfix/smtpd[11486]: warning: SASL: Connect to private/auth failed: Connection refused
Sep 25 19:34:01 localhost postfix/smtpd[11486]: fatal: no SASL authentication mechanisms
Sep 25 19:34:02 localhost postfix/master[4556]: warning: process /usr/lib/postfix/smtpd pid 11486 exit status 1
Sep 25 19:34:02 localhost postfix/master[4556]: warning: /usr/lib/postfix/smtpd: bad command startup -- throttling
Sep 25 19:34:02 localhost postfix/postscreen[11483]: CONNECT from [MYIPADDRESS]:58839 to [MYSERVERIPADDRESS]:25
Sep 25 19:34:02 localhost postfix/postscreen[11483]: PASS OLD [MYIPADDRESS]:58839
Sep 25 19:35:02 localhost postfix/smtpd[11780]: connect from MYHOSTMASK[MYIPADDRESS]
Sep 25 19:35:49 localhost dovecot: auth-worker: mysql(127.0.0.1): Connected to database mailserver
Sep 25 19:35:49 localhost dovecot: imap-login: Login: user=<MY@EMAILADDRESS.COM>, method=PLAIN, rip=MYIPADDRESS, lip=MYSERVERIPADDRESS, mpid=11804, TLS
Sep 25 19:38:07 localhost postfix/anvil[11379]: statistics: max connection rate 1/60s for (submission:MYIPADDRESS) at Sep 25 19:28:57
Sep 25 19:38:07 localhost postfix/anvil[11379]: statistics: max connection count 1 for (submission:MYIPADDRESS) at Sep 25 19:28:57
Sep 25 19:38:07 localhost postfix/anvil[11379]: statistics: max cache size 2 at Sep 25 19:28:57
Sep 25 19:39:02 localhost postfix/smtpd[11780]: lost connection after UNKNOWN from MYHOSTMASK[MYIPADDRESS]
Sep 25 19:39:02 localhost postfix/smtpd[11780]: disconnect from MYHOSTMASK[MYIPADDRESS]
Sep 25 19:39:02 localhost postfix/smtpd[11945]: connect from MYHOSTMASK[MYIPADDRESS]
Sep 25 19:39:03 localhost postfix/smtpd[11945]: warning: SASL: Connect to private/auth failed: Connection refused
Sep 25 19:39:03 localhost postfix/smtpd[11945]: fatal: no SASL authentication mechanisms
Sep 25 19:39:04 localhost postfix/master[4556]: warning: process /usr/lib/postfix/smtpd pid 11945 exit status 1

同样，我收不到或无法发送邮件。似乎 postfix 正在崩溃，过早退出怎么办。我没有想法，我真的不想把所有东西都抹掉并重新开始设置。有什么想法吗？这是在 Ubuntu 12.04 上运行的 VPS

编辑

postconf -n 输出：

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
config_directory = /etc/postfix
inet_interfaces = all
inet_protocols = ipv4
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
mydestination = localhost
myhostname = lightningcoders.com
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
myorigin = /etc/mailname
readme_directory = no
recipient_delimiter = +
relayhost =
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_path = private/auth
smtpd_sasl_type = dovecot
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /etc/ssl/certs/dovecot.pem
smtpd_tls_key_file = /etc/ssl/private/dovecot.pem
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf
virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf
virtual_transport = lmtp:unix:private/dovecot-lmtp

后缀主配​​置：

root@orion:~# cat /etc/postfix/master.cf | grep ^smtp
smtp      inet  n       -       -       -       -       smtpd
smtp      inet  n       -       -       -       1       postscreen
smtpd     pass  -       -       -       -       -       smtpd
smtp      unix  -       -       -       -       -       smtp

编辑2：

root@orion:/home/jknipp# ls -ld /var/spool/postfix/private/auth
srw-rw-rw- 1 postfix postfix 0 Sep 25 02:38 /var/spool/postfix/private/auth

至于 dovecot 配置：

2.0.19: /etc/dovecot/dovecot.conf
# OS: Linux 3.9.3-x86_64-linode33 x86_64 Ubuntu 12.04.3 LTS ext3
auth_mechanisms = plain login
mail_location = maildir:/var/mail/vhosts/%d/%n
mail_privileged_group = mail
passdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
protocols = imap pop3 lmtp
ssl = required
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
  args = uid=vmail gid=vmail home=/var/mail/vhosts/%d/%n
  driver = static
}

我的同事设置了一些非常严格的初始防火墙规则，即只打开需要的端口。目前这些端口是开放的： 22,10000,25,587,993,143,110,465,21, 80, 443, 6667. 我需要开放特定的端口吗？

Answer 1

根据您的编辑，我没有看到您根本没有配置 Dovecot 的 auth 套接字侦听器。它是您链接的指南中 Dovecot 部分的第 34 和 35 号。

如果您使用 conf.d 目录结构（如指南中所建议的），请确保包含所有相关部分conf.d/10-master.conf以及它们应该在的位置。

修复或添加这些后，重新启动 Dovecot 并doveconf -n应在某处包含以下内容：

...
  unix_listener /var/spool/postfix/private/auth {
    mode = 0666
    user = postfix
    group = postfix
  }
...

您不需要在防火墙上打开任何特殊端口，因为 Postfix 和 Dovecot 在同一台机器上，并且 Postfix 通过上述指令配置的套接字侦听器与 Dovecot 对话。