我正在尝试在 VPS（VPS 1）上设置 Interspire Email Marketer (IEM) 的 Bounce 功能，但出现了以下错误。我不是开发人员，所以不明白发生了什么。
我将 IEM 移至具有相同设置的新服务器，并使用 dovecot 重新安装了新的邮件服务器。
IEM 的退回电子邮件设置使用 POP3 帐户和自动检测设置，与以前一样，但在 Dovecot 服务器（VPS 2）上...每次我尝试测试退回设置时都会出现以下错误：
Sep 12 16:06:01 mail dovecot: pop3-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, session=<SkWEnisFkJyiE0K4>
Sep 12 16:06:01 mail dovecot: pop3-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, TLS handshaking: Connection closed, session=<4VuEnisFkpyiE0K4>
Sep 12 16:06:01 mail dovecot: pop3-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, TLS handshaking: Connection closed, session=<dayHnisFmJyiE0K4>
Sep 12 16:06:01 mail dovecot: pop3-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, TLS handshaking: Connection closed, session=<0SCLnisFopyiE0K4>
Sep 12 16:06:02 mail dovecot: pop3-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, TLS handshaking: Connection closed, session=<8aCOnisFsJyiE0K4>
Sep 12 16:06:02 mail dovecot: pop3-login: Disconnected: Aborted login by logging out (no auth attempts in 0 secs): user=<>, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, session=<agWSnisFtpyiE0K4>
Sep 12 16:06:02 mail dovecot: pop3-login: Disconnected: Aborted login by logging out (no auth attempts in 0 secs): user=<>, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, session=<V0eVnisFvpyiE0K4>
Sep 12 16:06:02 mail dovecot: pop3-login: Disconnected: Disconnected: Too many bad commands (no auth attempts in 0 secs): user=<>, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, session=<V6qYnisFwJyiE0K4>
Sep 12 16:06:03 mail dovecot: pop3-login: Disconnected: Disconnected: Too many bad commands (no auth attempts in 0 secs): user=<>, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, session=<zBOcnisFxpyiE0K4>
Sep 12 16:06:03 mail dovecot: pop3-login: Disconnected: Disconnected: Too many bad commands (no auth attempts in 0 secs): user=<>, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, session=<2sWlnisF0JyiE0K4>
Sep 12 16:06:03 mail dovecot: pop3-login: Disconnected: Disconnected: Too many bad commands (no auth attempts in 0 secs): user=<>, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, session=<nxupnisF4JyiE0K4>
Sep 12 16:06:05 mail dovecot: pop3-login: Disconnected: Connection closed (no auth attempts in 0 secs): user=<>, rip=XXX.XXX.XXX.XXX, lip=YYY.YYY.YYY.YYY, TLS handshaking: Connection closed, session=<Oqi/nisF8JyiE0K4>
我已经更改了 dovecot 配置中的几项内容，但在安装邮件服务器时我没有被告知要做什么。
有人知道问题可能出在哪里吗？非常感谢。
哦，顺便说一下，iredmail/dovecot/postfix 的其他方面都运行良好。
# More details about Dovecot settings: https://doc.dovecot.org
# Listen addresses.
# - '*' means all available IPv4 addresses.
# - '[::]' means all available IPv6 addresses.
# Listen on all available addresses by default
listen = * [::]
#base_dir = /var/run/dovecot
mail_plugins = quota mailbox_alias acl mail_log notify
# Enabled mail protocols.
protocols = pop3 imap sieve lmtp
# User/group who owns the message files:
mail_uid = 2000
mail_gid = 2000
# Assign uid to virtual users.
first_valid_uid = 2000
last_valid_uid = 2000
# Logging. Reference: http://wiki2.dovecot.org/Logging
#
# Use syslog
syslog_facility = local5
# Debug
#mail_debug = yes
#auth_verbose = yes
#auth_debug = yes
#auth_debug_passwords = yes
# Possible values: no, yes, plain, sha1.
# Set to 'yes' or 'plain', to output plaintext password (NOT RECOMMENDED).
#auth_verbose_passwords = no
# SSL: Global settings.
# Refer to wiki site for per protocol, ip, server name SSL settings:
# http://wiki2.dovecot.org/SSL/DovecotConfiguration
ssl_min_protocol = TLSv1.2
#ssl_protocols = !SSLv3
ssl = required
verbose_ssl = no
#ssl_ca = </path/to/ca
#ssl_cert = </etc/ssl/certs/iRedMail.crt
#ssl_key = </etc/ssl/private/iRedMail.key
ssl_cert = </etc/letsencrypt/live/mymaildomain.com/fullchain.pem
ssl_key = </etc/letsencrypt/live/mymaildomain.com/privkey.pem
ssl_dh = </etc/ssl/dh2048_param.pem
# Fix 'The Logjam Attack'
#ssl_cipher_list = EECDH+CHACHA20:EECDH+AESGCM:EDH+AESGCM:AES256+EECDH
ssl_cipher_list = ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5
ssl_prefer_server_ciphers = yes
# With disable_plaintext_auth=yes AND ssl=required, STARTTLS is mandatory.
# Set disable_plaintext_auth=no AND ssl=yes to allow plain password transmitted
# insecurely.
disable_plaintext_auth = yes
# Allow plain text password per IP address/net
#remote 192.168.0.0/24 {
# disable_plaintext_auth = no
#}
# Mail location and mailbox format.
mail_location = maildir:%Lh/Maildir/:INDEX=%Lh/Maildir/
# Authentication related settings.
# Append this domain name if client gives empty realm.
#auth_default_realm = 4elife.net
# Authentication mechanisms.
auth_mechanisms = PLAIN LOGIN
# Limits the number of users that can be logging in at the same time.
# Default is 100. This can be overridden by `process_limit =` in
# `service [protocol]` block.
# e.g.
# protocol imap-login {
# ...
# process_limit = 500
# }
#default_process_limit = 100
# Login log elements.
# Add '%k' for detailed SSL protocol and cipher information.
# e.g. "TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)"
login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c %k session=<%{session}>
# Mail delivery log format
deliver_log_format = from=%{from}, envelope_sender=%{from_envelope}, subject=%{subject}, msgid=%m, size=%{size}, delivery_time=%{delivery_time}ms, %$
service auth {
unix_listener /var/spool/postfix/private/dovecot-auth {
user = postfix
group = postfix
mode = 0666
}
unix_listener auth-master {
user = vmail
group = vmail
mode = 0666
}
unix_listener auth-userdb {
user = vmail
group = vmail
mode = 0660
}
}
# LMTP server (Local Mail Transfer Protocol).
# Reference: http://wiki2.dovecot.org/LMTP
service lmtp {
user = vmail
# For higher volume sites, it may be desirable to increase the number of
# active listener processes. A range of 5 to 20 is probably good for most
# sites.
process_min_avail = 5
# Logging.
executable = lmtp -L
# Listening on socket file and TCP
unix_listener /var/spool/postfix/private/dovecot-lmtp {
user = postfix
group = postfix
mode = 0600
}
inet_listener lmtp {
# Listen on localhost (ipv4)
address = 127.0.0.1
port = 24
}
}
# Virtual mail accounts.
userdb {
args = /etc/dovecot/dovecot-mysql.conf
driver = sql
}
passdb {
args = /etc/dovecot/dovecot-mysql.conf
driver = sql
}
# Master user.
# Master users are able to log in as other users. It's also possible to
# directly log in as any user using a master password, although this isn't
# recommended.
# Reference: http://wiki2.dovecot.org/Authentication/MasterUsers
auth_master_user_separator = *
passdb {
driver = passwd-file
args = /etc/dovecot/dovecot-master-users
master = yes
}
plugin {
# Quota configuration.
# Reference: http://wiki2.dovecot.org/Quota/Configuration
quota = dict:user::proxy::quotadict
# Set default quota rule if no quota returned from SQL/LDAP query.
#quota_rule = *:storage=1G
#quota_rule2 = *:messages=0
#quota_rule3 = Trash:storage=1G
#quota_rule4 = Junk:ignore
# Quota warning.
#
# If user suddenly receives a huge mail and the quota jumps from
# 85% to 95%, only the 95% script is executed.
#
# Only the command for the first exceeded limit is executed, so configure
# the highest limit first.
quota_warning = storage=100%% quota-warning 100 %u
quota_warning2 = storage=95%% quota-warning 95 %u
quota_warning3 = storage=90%% quota-warning 90 %u
quota_warning4 = storage=85%% quota-warning 85 %u
# allow user to become max 10% (or 50 MB) over quota
quota_grace = 10%%
#quota_grace = 50 M
# Custom Quota Exceeded Message.
# You can specify the message directly or read the message from a file.
#quota_exceeded_message = Quota exceeded, please try again later.
#quota_exceeded_message = </path/to/quota_exceeded_message.txt
# Used by quota-status service.
quota_status_success = DUNNO
quota_status_nouser = DUNNO
quota_status_overquota = "552 5.2.2 Mailbox is full"
# ACL and share folder
acl = vfile
acl_shared_dict = proxy::acl
# By default Dovecot doesn't allow using the IMAP "anyone" or
# "authenticated" identifier, because it would be an easy way to spam
# other users in the system. If you wish to allow it,
#acl_anyone = allow
# Pigeonhole managesieve service.
# Reference: http://wiki2.dovecot.org/Pigeonhole/Sieve/Configuration
# Per-user sieve settings.
sieve_dir = ~/sieve
sieve = ~/sieve/dovecot.sieve
# Global sieve settings.
sieve_global_dir = /var/vmail/sieve
# Note: if user has personal sieve script, global sieve rules defined in
# sieve_default will be ignored. Please use sieve_before or
# sieve_after instead.
#sieve_default =
sieve_before = /var/vmail/sieve/dovecot.sieve
#sieve_after =
# The maximum number of redirect actions that can be performed during a
# single script execution.
# The meaning of 0 differs based on your version. For pigeonhole-0.3.0 and
# beyond this means that redirect is prohibited. For older versions,
# however, this means that the number of redirects is unlimited.
sieve_max_redirects = 30
# Use recipient as vacation message sender instead of null sender (<>).
sieve_vacation_send_from_recipient = yes
# Reference: http://wiki2.dovecot.org/Plugins/MailboxAlias
mailbox_alias_old = Sent
mailbox_alias_new = Sent Messages
mailbox_alias_old2 = Sent
mailbox_alias_new2 = Sent Items
# Events to log. `autoexpunge` is included in `expunge`
# Defined in https://github.com/dovecot/core/blob/master/src/plugins/mail-log/mail-log-plugin.c
mail_log_events = delete undelete expunge copy mailbox_create mailbox_delete mailbox_rename
mail_log_fields = uid box msgid size from subject flags
# Track user last login
last_login_dict = proxy::lastlogin
last_login_key = last-login/%s/%u/%d
}
service stats {
fifo_listener stats-mail {
user = vmail
mode = 0644
}
unix_listener stats-writer {
user = vmail
group = vmail
mode = 0660
}
inet_listener {
address = 127.0.0.1
port = 24242
}
}
service quota-warning {
executable = script /usr/local/bin/dovecot-quota-warning.sh
unix_listener quota-warning {
user = vmail
group = vmail
mode = 0660
}
}
service quota-status {
# '-p <protocol>'. Currently only 'postfix' protocol is supported.
executable = quota-status -p postfix
client_limit = 1
inet_listener {
address = 127.0.0.1
port = 12340
}
}
service dict {
unix_listener dict {
mode = 0660
user = vmail
group = vmail
}
}
dict {
quotadict = mysql:/etc/dovecot/dovecot-used-quota.conf
acl = mysql:/etc/dovecot/dovecot-share-folder.conf
lastlogin = mysql:/etc/dovecot/dovecot-last-login.conf
}
protocol lda {
mail_plugins = $mail_plugins sieve
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
}
protocol lmtp {
# Plugins
mail_plugins = $mail_plugins sieve
# Address extension delivery
lmtp_save_to_detail_mailbox = yes
recipient_delimiter = +
}
protocol imap {
mail_plugins = $mail_plugins imap_quota imap_acl last_login
imap_client_workarounds = tb-extra-mailbox-sep
# Maximum number of IMAP connections allowed for a user from each IP address.
# NOTE: The username is compared case-sensitively.
# Default is 10.
# Increase it to avoid issue like below:
# "Maximum number of concurrent IMAP connections exceeded"
mail_max_userip_connections = 30
}
protocol pop3 {
mail_plugins = $mail_plugins last_login
pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
pop3_uidl_format = %08Xu%08Xv
# Maximum number of IMAP connections allowed for a user from each IP address.
# NOTE: The username is compared case-sensitively.
# Default is 10.
mail_max_userip_connections = 30
# POP3 logout format string:
# %i - total number of bytes read from client
# %o - total number of bytes sent to client
# %t - number of TOP commands
# %p - number of bytes sent to client as a result of TOP command
# %r - number of RETR commands
# %b - number of bytes sent to client as a result of RETR command
# %d - number of deleted messages
# %m - number of messages (before deletion)
# %s - mailbox size in bytes (before deletion)
# Default format doesn't have 'in=%i, out=%o'.
#pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m, size=%s, in=%i, out=%o
}
# Login processes. Refer to Dovecot wiki for more details:
# http://wiki2.dovecot.org/LoginProcess
service imap-login {
#inet_listener imap {
# port = 143
#}
#inet_listener imaps {
# port = 993
# ssl = yes
#}
service_count = 1
# To avoid startup latency for new client connections, set process_min_avail
# to higher than zero. That many idling processes are always kept around
# waiting for new connections.
#process_min_avail = 0
# number of simultaneous IMAP connections
process_limit = 800
# vsz_limit should be fine at its default 64MB value
#vsz_limit = 64M
}
service pop3-login {
#inet_listener pop3 {
# port = 110
#}
#inet_listener pop3s {
# port = 995
# ssl = yes
#}
service_count = 1
# number of simultaneous POP3 connections
#process_limit = 500
}
service managesieve-login {
inet_listener sieve {
# Listen on localhost (ipv4)
address = 127.0.0.1
port = 4190
}
}
namespace {
type = private
separator = /
prefix =
inbox = yes
# Refer to document for more details about alias mailbox:
# http://wiki2.dovecot.org/MailboxSettings
#
# Sent
mailbox Sent {
auto = subscribe
special_use = \Sent
}
mailbox "Sent Messages" {
auto = no
special_use = \Sent
}
mailbox "Sent Items" {
auto = no
special_use = \Sent
}
mailbox Drafts {
auto = subscribe
special_use = \Drafts
}
# Trash
mailbox Trash {
auto = subscribe
special_use = \Trash
}
mailbox "Deleted Messages" {
auto = no
special_use = \Trash
}
# Junk
mailbox Junk {
auto = subscribe
special_use = \Junk
}
mailbox Spam {
auto = no
special_use = \Junk
}
mailbox "Junk E-mail" {
auto = no
special_use = \Junk
}
# Archive
mailbox Archive {
auto = no
special_use = \Archive
}
mailbox Archives {
auto = no
special_use = \Archive
}
}
namespace {
type = shared
separator = /
prefix = Shared/%%u/
location = maildir:%%Lh/Maildir/:INDEX=%%Lh/Maildir/Shared/%%Ld/%%Ln
# this namespace should handle its own subscriptions or not.
subscriptions = yes
list = children
}
# Public mailboxes.
# Refer to Dovecot wiki page for more details:
# http://wiki2.dovecot.org/SharedMailboxes/Public
#namespace {
# type = public
# separator = /
# prefix = Public/
# location = maildir:/var/vmail/public:CONTROL=%Lh/Maildir/public:INDEXPVT=%Lh/Maildir/public
#
# # Allow users to subscribe to the public folders.
# subscriptions = yes
#}
!include_try /etc/dovecot/iredmail/*.conf