请问，您能帮我解决我的问题吗？我安装了 VPS。一切正常，除了电子邮件，我无法弄清楚，为什么它不能按预期工作 - 尝试登录时 Squirell 邮件返回：
错误：IMAP 服务器断开连接。
您知道哪里可能存在问题吗？我是这方面的新手，我不太清楚，我该怎么办？
这是我的邮件错误日志文件。
Aug 8 13:48:33 vps191267 dovecot: imap-login: Disconnected: Too many invalid commands (no auth attempts in 57 secs): user=<>, rip=188.175.155.118, lip=5.135.147.5, session=<kU3/VMsczAC8r5t2>
Aug 8 13:48:52 vps191267 dovecot: auth-worker(16650): mysql(localhost): Connected to database dbispconfig
Aug 8 13:48:52 vps191267 dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?2492858369?16648?1?267a629bebc2e583c3dd1c16f0bbe4d6
Aug 8 13:48:52 vps191267 dovecot: pop3: Error: Authentication server didn't send valid SPID as expected: MECH PLAIN plaintext
Aug 8 13:48:52 vps191267 dovecot: pop3: Error: Disconnected from auth server, aborting (client-pid=16648 client-id=1)
Aug 8 13:48:52 vps191267 dovecot: pop3-login: Internal login failure (pid=16648 id=1) (internal failure, 1 succesful auths): user=<[email protected]>, method=PLAIN, rip=188.175.155.118, lip=5.135.147.5, mpid=16651, TLS, session=<X6AcVsscFgC8r5t2>
Aug 8 13:48:52 vps191267 dovecot: auth: Warning: auth client 16648 disconnected with 1 pending requests: EOF
Aug 8 13:48:52 vps191267 dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?3822977025?16652?1?b44d33a06c31a87042d6fd62ead367eb
Aug 8 13:48:52 vps191267 dovecot: pop3: Error: Authentication server didn't send valid SPID as expected: MECH PLAIN plaintext
Aug 8 13:48:52 vps191267 dovecot: pop3: Error: Disconnected from auth server, aborting (client-pid=16652 client-id=1)
Aug 8 13:48:52 vps191267 dovecot: pop3-login: Internal login failure (pid=16652 id=1) (internal failure, 1 succesful auths): user=<[email protected]>, method=PLAIN, rip=188.175.155.118, lip=5.135.147.5, mpid=16653, TLS, session=<jiYiVsscFwC8r5t2>
Aug 8 13:48:52 vps191267 dovecot: auth: Warning: auth client 16652 disconnected with 1 pending requests: EOF
Aug 8 13:48:52 vps191267 dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?3522297857?16654?1?c451433874707f84a4507c06f1baa0b0
Aug 8 13:48:52 vps191267 dovecot: pop3: Error: Authentication server didn't send valid SPID as expected: MECH PLAIN plaintext
Aug 8 13:48:52 vps191267 dovecot: pop3: Error: Disconnected from auth server, aborting (client-pid=16654 client-id=1)
Aug 8 13:48:52 vps191267 dovecot: pop3-login: Internal login failure (pid=16654 id=1) (internal failure, 1 succesful auths): user=<[email protected]>, method=LOGIN, rip=188.175.155.118, lip=5.135.147.5, mpid=16655, TLS, session=<mWknVsscGAC8r5t2>
Aug 8 13:48:52 vps191267 dovecot: auth: Warning: auth client 16654 disconnected with 1 pending requests: EOF
Aug 8 13:48:53 vps191267 dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?688128001?16656?1?7cdc3d5f20c3a059dd83f3536b8741a3
Aug 8 13:48:53 vps191267 dovecot: pop3: Error: Authentication server didn't send valid SPID as expected: MECH PLAIN plaintext
Aug 8 13:48:53 vps191267 dovecot: pop3: Error: Disconnected from auth server, aborting (client-pid=16656 client-id=1)
Aug 8 13:48:53 vps191267 dovecot: pop3-login: Internal login failure (pid=16656 id=1) (internal failure, 1 succesful auths): user=<[email protected]>, method=LOGIN, rip=188.175.155.118, lip=5.135.147.5, mpid=16658, TLS, session=<xnssVsscGQC8r5t2>
Aug 8 13:48:53 vps191267 dovecot: auth: Warning: auth client 16656 disconnected with 1 pending requests: EOF
Aug 8 13:48:53 vps191267 dovecot: auth: Error: BUG: Authentication client sent unknown handshake command: REQUEST?2325348353?16659?1?867f8b63203996bc42ef07ce4b9e07b3
Aug 8 13:48:53 vps191267 dovecot: pop3: Error: Authentication server didn't send valid SPID as expected: MECH PLAIN plaintext
Aug 8 13:48:53 vps191267 dovecot: pop3: Error: Disconnected from auth server, aborting (client-pid=16659 client-id=1)
Aug 8 13:48:53 vps191267 dovecot: pop3-login: Internal login failure (pid=16659 id=1) (internal failure, 1 succesful auths): user=<[email protected]>, method=PLAIN, rip=188.175.155.118, lip=5.135.147.5, mpid=16660, TLS, session=<toQ1VsscGgC8r5t2>
Aug 8 13:48:53 vps191267 dovecot: auth: Warning: auth client 16659 disconnected with 1 pending requests: EOF
doveconf-n
auth_mechanisms = plain login
disable_plaintext_auth = no
listen = *,[::]
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_privileged_group = vmail
passdb {
args = /etc/dovecot/dovecot-sql.conf
driver = sql
}
plugin {
quota = dict:user::file:/var/vmail/%d/%n/.quotausage
sieve = /var/vmail/%d/%n/.sieve
}
protocols = imap pop3
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0660
user = postfix
}
unix_listener auth-userdb {
group = vmail
mode = 0600
user = vmail
}
user = root
}
service imap-login {
client_limit = 1000
process_limit = 500
}
ssl_cert = </etc/postfix/smtpd.cert
ssl_key = </etc/postfix/smtpd.key
ssl_protocols = !SSLv2 !SSLv3
userdb {
args = /etc/dovecot/dovecot-sql.conf
driver = sql
}
protocol imap {
mail_plugins = quota imap_quota
}
protocol pop3 {
mail_plugins = quota
pop3_uidl_format = %08Xu%08Xv
}
protocol lda {
mail_plugins = sieve quota
}