我在 Ubuntu 服务器 10.04 上拥有一个带 Plesk Panel 的 VPS。一切都设置好了，运行正常。我对邮件配置所做的唯一更改是允许提交端口 587。一切仍然正常：imap、smtp 等。
但昨天，我想是在更新后，我注意到我无法发送邮件。所以，现在没有办法让它工作了。
以下是我收到的消息/var/log/mail.info：
postfix/smtpd[9523]: warning: SASL authentication failure: no secret in database
postfix/smtpd[9523]: warning: SASL DIGEST-MD5 authentication failed: One time use of a plaintext password will enable requested mechanism for user
postfix/smtpd[9523]: disconnect...
有许多教程可以使 postfix 与 dovecot 一起工作，但我不敢安装 dovecot，因为当我运行 apt-get install dovecot-imapd 时，它说许多 psa-* 功能将被删除。
欢迎任何帮助。直到昨晚我尝试了在 Google 上找到的一些解决方案，但毫无进展。。
这是我的main.cf：
# See /usr/share/postfix/main.cf.dist for a commented, more complete version
# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no
# appending .domain is the MUA's job.
append_dot_mydomain = no
# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h
readme_directory = no
# TLS parameters
smtpd_tls_cert_file = /etc/postfix/postfix_default.pem
smtpd_tls_key_file = $smtpd_tls_cert_file
smtpd_use_tls = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.
myhostname = lvps5-35-246-107.dedicated.hosteurope.de
alias_maps = hash:/etc/aliases, hash:/var/spool/postfix/plesk/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = localhost.localdomain, localhost.dedicated.hosteurope.de, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::1]/128 5.35.246.107/32
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 51200000
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all
virtual_mailbox_domains = $virtual_mailbox_maps, hash:/var/spool/postfix/plesk/virtual_domains
virtual_alias_maps = $virtual_maps, hash:/var/spool/postfix/plesk/virtual
virtual_mailbox_maps = hash:/var/spool/postfix/plesk/vmailbox
transport_maps = hash:/var/spool/postfix/plesk/transport
smtpd_tls_security_level = may
smtp_tls_security_level = may
smtp_use_tls = no
smtpd_timeout = 3600s
smtpd_proxy_timeout = 3600s
disable_vrfy_command = yes
smtpd_sender_restrictions = check_sender_access hash:/var/spool/postfix/plesk/blacklists, permit_sasl_authenticated, check_client_access pcre:/var/spool/postfix/plesk/non_auth.re
smtpd_client_restrictions = permit_mynetworks
smtp_send_xforward_command = yes
smtpd_authorized_xforward_hosts = 127.0.0.0/8 [::1]/128
# SASL
#smtpd_sasl_type = dovecot
smtpd_sasl_auth_enable = yes
#smtpd_sasl_path = smtpd
# If your potential clients use Outlook Express or other older clients
# this needs to be set to yes
broken_sasl_auth_clients = yes
smtpd_sasl_security_options = noanonymous
smtpd_recipient_restrictions = permit_mynetworks, check_client_access pcre:/var/spool/postfix/plesk/no_relay.re, permit_sasl_authenticated, reject_unauth_destination
virtual_mailbox_base = /var/qmail/mailnames
virtual_uid_maps = static:110
virtual_gid_maps = static:31
smtpd_milters = inet:localhost:12768
non_smtpd_milters = inet:localhost:12768
sender_dependent_default_transport_maps = hash:/var/spool/postfix/plesk/sdd_transport_maps
virtual_transport = plesk_virtual
plesk_virtual_destination_recipient_limit = 1
mailman_destination_recipient_limit = 1
message_size_limit = 10240000
smtpd_tls_loglevel = 4
和我的master.cf：
#
# Postfix master process configuration file. For details on the format
# of the file, see the master(5) manual page (command: "man 5 master").
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ==========================================================================
# service type private unpriv chroot wakeup maxproc command + args
# (yes) (yes) (yes) (never) (100)
# ==========================================================================
# -o smtpd_tls_security_level=encrypt
# -o smtpd_sasl_auth_enable=yes
# -o smtpd_client_restrictions=permit_sasl_authenticated,reject
# -o milter_macro_daemon_name=ORIGINATING
# -o smtpd_tls_wrappermode=yes
# -o smtpd_sasl_auth_enable=yes
# -o smtpd_client_restrictions=permit_sasl_authenticated,reject
# -o milter_macro_daemon_name=ORIGINATING
#628 inet n - - - - qmqpd
pickup fifo n - - 60 1 pickup
cleanup unix n - - - 0 cleanup
qmgr fifo n - n 1 1 qmgr
#qmgr fifo n - - 300 1 oqmgr
tlsmgr unix - - - 1000? 1 tlsmgr
rewrite unix - - - - - trivial-rewrite
bounce unix - - - - 0 bounce
defer unix - - - - 0 bounce
trace unix - - - - 0 bounce
verify unix - - - - 1 verify
flush unix n - - 1000? 0 flush
proxymap unix - - n - - proxymap
proxywrite unix - - n - 1 proxymap
smtp inet n - n - - smtpd
submission inet n - n - - smtpd
# When relaying mail as backup MX, disable fallback_relay to avoid MX loops
relay unix - - - - - smtp
-o smtp_fallback_relay=
# -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq unix n - - - - showq
error unix - - - - - error
retry unix - - - - - error
discard unix - - - - - discard
local unix - n n - - local
virtual unix - n n - - virtual
lmtp unix - - - - - lmtp
anvil unix - - - - 1 anvil
scache unix - - - - 1 scache
#
...
我不是这方面的专家，现在这变得非常烦人。它本来运行正常，但现在我无法发送邮件。
答案1
我找不到解决方案，但我设法通过重新安装来修复它。我在 Parallels 论坛上发布了这个问题，但没有找到帮助。
"Updates and Upgrades"最后，我在Plesk Panel 部分找到了链接"Server"。在那里我进入"Add component"，并安装QMail为 SMPT，因此它自动删除Postfix，然后再次安装Postfix，因此QMail它自动删除。
这改变了 Postfix 的settings to the default。然后我submission port再次启用它，并将所有内容保留为默认设置，就像第一次一样。
现在它又能正常工作了。电子邮件地址被保留，一切正常。
我想也许有类似问题的人会发现这很有用，所以我回答了我的问题：）