已经搞定，也可以不用https访问了，谢谢iredmail项目组

phpmyadmin页面打不开，404 Not found错误

System ubuntu1604
iRedMail    v0.9.8
iRedAdmin    v0.9.1 (LDAP)

问题描述

Dovecot配置

root@fk:~# doveconf -n
# 2.2.22 (fe789d2): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.13 (7b14904)
# OS: Linux 4.4.0-116-generic x86_64 Ubuntu 16.04.4 LTS
auth_master_user_separator = *
auth_mechanisms = PLAIN LOGIN
deliver_log_format = from=%{from}, envelope_sender=%{from_envelope}, subject=%{subject}, msgid=%m, size=%{size}, %$
dict {
  acl = mysql:/etc/dovecot/dovecot-share-folder.conf
  quotadict = mysql:/etc/dovecot/dovecot-used-quota.conf
}
first_valid_uid = 2000
last_valid_uid = 2000
listen = * [::]
mail_gid = 2000
mail_location = maildir:%Lh/Maildir/:INDEX=%Lh/Maildir/
mail_plugins = quota mailbox_alias acl mail_log notify stats welcome
mail_uid = 2000
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext
namespace {
  inbox = yes
  location =
  mailbox Archive {
    auto = no
    special_use = \Archive
  }
  mailbox Archives {
    auto = no
    special_use = \Archive
  }
  mailbox "Deleted Messages" {
    auto = no
    special_use = \Trash
  }
  mailbox Drafts {
    auto = subscribe
    special_use = \Drafts
  }
  mailbox Junk {
    auto = subscribe
    special_use = \Junk
  }
  mailbox "Junk E-mail" {
    auto = no
    special_use = \Junk
  }
  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox "Sent Items" {
    auto = no
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    auto = no
    special_use = \Sent
  }
  mailbox Spam {
    auto = no
    special_use = \Junk
  }
  mailbox Trash {
    auto = subscribe
    special_use = \Trash
  }
  prefix =
  separator = /
  type = private
}
namespace {
  list = children
  location = maildir:%%Lh/Maildir/:INDEX=%%Lh/Maildir/Shared/%%Ld/%%Ln
  prefix = Shared/%%u/
  separator = /
  subscriptions = yes
  type = shared
}
passdb {
  args = /etc/dovecot/dovecot-ldap.conf
  driver = ldap
}
passdb {
  args = /etc/dovecot/dovecot-master-users
  driver = passwd-file
  master = yes
}
plugin {
  acl = vfile
  acl_shared_dict = proxy::acl
  mail_log_events = delete undelete expunge mailbox_delete mailbox_rename
  mail_log_fields = uid box msgid size from subject
  mailbox_alias_new = Sent Messages
  mailbox_alias_new2 = Sent Items
  mailbox_alias_old = Sent
  mailbox_alias_old2 = Sent
  quota = dict:user::proxy::quotadict
  quota_grace = 10%%
  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
  sieve = %Lh/sieve/dovecot.sieve
  sieve_before = /var/vmail/sieve/dovecot.sieve
  sieve_dir = %Lh/sieve
  sieve_global_dir = /var/vmail/sieve
  sieve_max_redirects = 30
  stats_refresh = 30 secs
  stats_track_cmds = yes
  welcome_script = welcome %u
  welcome_wait = yes
}
protocols = pop3 imap sieve lmtp
service auth {
  unix_listener /var/spool/postfix/private/dovecot-auth {
    group = postfix
    mode = 0666
    user = postfix
  }
  unix_listener auth-master {
    group = vmail
    mode = 0666
    user = vmail
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service dict {
  unix_listener dict {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service imap-login {
  process_limit = 500
  service_count = 1
}
service lmtp {
  executable = lmtp -L
  inet_listener lmtp {
    address = 127.0.0.1
    port = 24
  }
  process_min_avail = 5
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
  user = vmail
}
service managesieve-login {
  inet_listener sieve {
    address = 127.0.0.1
    port = 4190
  }
}
service pop3-login {
  service_count = 1
}
service quota-warning {
  executable = script /usr/local/bin/dovecot-quota-warning.sh
  unix_listener quota-warning {
    group = vmail
    mode = 0660
    user = vmail
  }
}
service stats {
  fifo_listener stats-mail {
    mode = 0644
    user = vmail
  }
  inet_listener {
    address = 127.0.0.1
    port = 24242
  }
}
service welcome {
  executable = script /usr/local/bin/welcome.sh
  unix_listener welcome {
    group = vmail
    mode = 0660
    user = vmail
  }
}
ssl = required
ssl_cert = </etc/ssl/certs/iRedMail.crt
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_key = </etc/ssl/private/iRedMail.key
ssl_prefer_server_ciphers = yes
ssl_protocols = !SSLv2 !SSLv3
syslog_facility = local5
userdb {
  args = /etc/dovecot/dovecot-ldap.conf
  driver = ldap
}
protocol lda {
  lda_mailbox_autocreate = yes
  lda_mailbox_autosubscribe = yes
  mail_plugins = quota mailbox_alias acl mail_log notify stats welcome sieve
}
protocol lmtp {
  lmtp_save_to_detail_mailbox = yes
  mail_plugins = quota sieve
  recipient_delimiter = +
}
protocol imap {
  imap_client_workarounds = tb-extra-mailbox-sep
  mail_max_userip_connections = 30
  mail_plugins = quota mailbox_alias acl mail_log notify stats welcome imap_quota imap_acl imap_stats
}
protocol pop3 {
  mail_max_userip_connections = 30
  mail_plugins = quota mailbox_alias acl mail_log notify stats welcome
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
  pop3_uidl_format = %08Xu%08Xv
}

======================================================================
以下是welcome.sh

root@fk:~# vi /usr/local/bin/welcome.sh

#!/bin/sh
USER=$1
cat << EOF | /usr/lib/dovecot/dovecot-lda -d $USER
From: admin at fk.com
Subject: Welcome

welcome!

EOF

--
fk.com

Tel: 0769-xxxxxxxx

rc登录报错
Aug 14 13:57:55 fk roundcube: <ln4e1sqe> IMAP Error: Login failed for postmaster@mail.abc123.com from 192.168.1.5. LOGIN: Internal error occurred. Refer to server log for more information. in /opt/www/roundcubemail-1.3.6/program/lib/Roundcube/rcube_imap.php on line 196 (POST /mail/?_task=login&_action=login)
Aug 14 13:58:48 fk roundcube: <ln4e1sqe> IMAP Error: Login failed for postmaster@mail.abc123.com from 192.168.1.5. LOGIN: Internal error occurred. Refer to server log for more information. in /opt/www/roundcubemail-1.3.6/program/lib/Roundcube/rcube_imap.php on line 196 (POST /mail/?_task=login&_action=login)
Aug 14 14:15:25 fk roundcube: <fd4ijo2s> IMAP Error: Login failed for postmaster@mail.abc123.com from 192.168.1.5. LOGIN: Internal error occurred. Refer to server log for more information. in /opt/www/roundcubemail-1.3.6/program/lib/Roundcube/rcube_imap.php on line 196 (POST /mail/?_task=login&_action=login)

dovecot status

root@fk:~# service dovecot status
● dovecot.service - Dovecot IMAP/POP3 email server
   Loaded: loaded (/lib/systemd/system/dovecot.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2018-08-14 14:14:53 CST; 1min 17s ago
     Docs: man:dovecot(1)
           http://wiki2.dovecot.org/
  Process: 10002 ExecStop=/usr/bin/doveadm stop (code=exited, status=0/SUCCESS)
  Process: 10010 ExecStart=/usr/sbin/dovecot (code=exited, status=0/SUCCESS)
Main PID: 10014 (dovecot)
    Tasks: 11
   Memory: 6.8M
      CPU: 273ms
   CGroup: /system.slice/dovecot.service
           ├─10014 /usr/sbin/dovecot
           ├─10029 dovecot/lmtp -L
           ├─10031 dovecot/anvil
           ├─10032 dovecot/log
           ├─10033 dovecot/ssl-params
           ├─10035 dovecot/lmtp -L
           ├─10036 dovecot/lmtp -L
           ├─10037 dovecot/lmtp -L
           ├─10039 dovecot/lmtp -L
           ├─10040 dovecot/config
           └─10064 dovecot/auth

Aug 14 14:14:53 fk systemd[1]: Starting Dovecot IMAP/POP3 email server...
Aug 14 14:14:53 fk systemd[1]: dovecot.service: PID file /var/run/dovecot/master.pid not readable (yet?) after start: No such file or directory
Aug 14 14:14:53 fk dovecot[10014]: master: Dovecot v2.2.22 (fe789d2) starting up for pop3, imap, sieve, lmtp (core dumps disabled)
Aug 14 14:14:53 fk systemd[1]: Started Dovecot IMAP/POP3 email server.
Aug 14 14:15:25 fk dovecot[10032]: imap-login: Login: user=<postmaster@mail.abc123.com>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=10065, secured,
Aug 14 14:15:25 fk dovecot[10032]: imap(postmaster@mail.abc123.com): Error: Plugin 'welcome' not found from directory /usr/lib/dovecot/modules
Aug 14 14:15:25 fk dovecot[10032]: imap(postmaster@mail.abc123.com): Error: Internal error occurred. Refer to server log for more information.
lines 1-31/31 (END)

为什么提示找不到modules，这是缺少什么modules没有安装吗？老大这该怎么解决？

ubuntu 16.04 的 dovecot 目录里确实没有这个插件 ...

我也有同样问题，后来这个问题如何解决的

==== 必填信息。没有填写将不予回复 ====
- iRedMail 版本：0.9.8
- 使用的 Linux/BSD 发行版名称及版本号：Ubuntu 18.04.1 LTS
- 与您的问题相关的日志信息：
====

求助，邮件服务器是从旧版刚升级到最新版，以前客户的邮件是可以正常发送过来的，升级后一直出现报错，邮件服务器一直拒收，导至无法接收客户邮件，部分日志如下：

Aug 22 21:27:15 mail postfix/smtpd[17093]: connect from unknown[218.24.167.29]
Aug 22 21:27:15 mail postfix/smtpd[17093]: Anonymous TLS connection established from unknown[218.24.167.29]: TLSv1 with cipher AES128-SHA (128/128 bits)
Aug 22 21:27:15 mail postfix/smtpd[17093]: NOQUEUE: reject: RCPT from unknown[218.24.167.29]: 450 4.7.1 <DLIDCHBSVR5.aeonlife.com.cn>: Helo command rejected: Host not found; from=<lichengjian@aeonlife.com.cn> to=<Shuanglu01@i-confluence.com> proto=ESMTP helo=<DLIDCHBSVR5.aeonlife.com.cn>
Aug 22 21:27:15 mail postfix/smtpd[17093]: NOQUEUE: reject: RCPT from unknown[218.24.167.29]: 450 4.7.1 <DLIDCHBSVR5.aeonlife.com.cn>: Helo command rejected: Host not found; from=<lichengjian@aeonlife.com.cn> to=<scottjiao@i-confluence.com> proto=ESMTP helo=<DLIDCHBSVR5.aeonlife.com.cn>
Aug 22 21:27:16 mail postfix/smtpd[17093]: disconnect from unknown[218.24.167.29] ehlo=2 starttls=1 mail=1 rcpt=0/2 quit=1 commands=5/7
Aug 22 21:27:16 mail postfix/postscreen[15775]: CONNECT from [181.214.206.123]:65062 to [192.168.202.40]:25
Aug 22 21:27:16 mail postfix/dnsblog[15777]: addr 181.214.206.123 listed by domain zen.spamhaus.org as 127.0.0.4
Aug 22 21:27:16 mail postfix/postscreen[15775]: DNSBL rank 3 for [181.214.206.123]:65062
Aug 22 21:27:16 mail postfix/postscreen[15775]: DISCONNECT [181.214.206.123]:65062

在官网上找到一个方法如下：

Helo command rejected: Host not found

Sample error message in Postfix log file:

    Aug 13 08:07:14 mail postfix/smtpd[8606]: NOQUEUE: reject: RCPT from mta02.globetel.com.ph[120.28.49.114]: 450 4.7.1 : Helo command rejected: Host not found; from=tcadd01@globetel.com.ph to=user@example.com proto=ESMTP helo=

Postfix does DNS query to verify whether A type of DNS record of HELO domain name mta02.globetel.com exists, if not, Postfix rejects the email.

As a temporary solution, you can whitelist this HELO hostname by adding a line like below at the top of file /etc/postfix/helo_access.pcre (Linux/OpenBSD) or /usr/local/etc/postfix/helo_access.pcre (FreeBSD):

/^mta02\.globetel\.com$/ OK

按照上面的提示，把客户地址加进去了，然后确实从日志上没看到报错了，但是问题来了，邮件没有收到，服务器又没有报错日志，这是什么原因呢？客户之前发的邮件去哪了呢？求大神帮帮忙，小弟先谢过了。

之前拒收的邮件没有进入你的服务器的邮件队列，所以用户必须重新发送（用户应该已经收到他自己的邮件服务器的通知，告知邮件被拒收了）。

问题解决了，除了按照官网上的做法，为了保险我还是增加了一步操作，
在 /etc/postfix/main.cf   注销了 reject_unknown_helo_hostname
测试邮件已通过，能正常接收邮件了。

==== 必填信息。没有填写将不予回复 ====
- iRedMail 版本：0.9.8
- 使用数据库存储用户帐号（MySQL）：MYSQL
- 使用的 Linux/BSD 发行版名称及版本号：Ubuntu18.04.1TLS
- 与您的问题相关的日志信息：
====

自从升级了iredmail后，感觉问题不断，前段时间解决了部分客户的收接问题，但是还是有个别客户的邮件无法接收，服务器上完全看不到日志，联系了对方，对方看到的状态是一直处于发送状态，最后定论的是我方DNS解析有问题，我详细的检查了一遍并没有发现问题，postscreen 并没有拦截它，MX 、SPF都是正确的设置，也能正常发送邮件到对方那边，但是我就是看不到对方回过来的邮件，服务器没有对方的日志信息。今天我把所有相关的日志又看了一遍，查看dovect日志的时候，满屏的报错日志，只有一条 dovecot:dict(57091):Error:mysql dict: commit failed: field 'domain' does not default value
我按照他的提示去 mysql Vmail 下的domain表修改默认数值，但是无论怎么改，还是这个报错。。。
我不明白，为什么会出现这样的报错，该如何修改
请张大神帮忙分析下原因，真心谢谢了。

系统centos7.4 刚安装最新版iredadmin,内部登录web发送接收外部邮件都没问题，出差异地发现不能用web登录邮箱，只能用邮箱客户端收发邮件，80和443端口都有做映射

刚装好后可以发邮件,对方回复被退信
第二天无法收发邮件
下面是日志
Aug 31 03:20:03 mail postfix/smtp[8926]: connect to mx3.qq.com[203.205.176.240]:25: Connection timed out
Aug 31 03:20:03 mail postfix/smtp[8928]: connect to 163mx02.mxmail.netease.com[220.181.14.150]:25: Connection timed out
Aug 31 03:20:33 mail postfix/smtp[8927]: connect to mx2.qq.com[184.105.206.30]:25: Connection timed out
Aug 31 03:20:33 mail postfix/smtp[8927]: 7EAFA7E974: to=<xxxxxxxxx@foxmail.com>, relay=none, delay=3332, delays=3211/0.02/122/0, dsn=4.4.1, status=deferred (connect to mx2.qq.com[184.105.206.30]:25: Connection timed out)
Aug 31 03:20:33 mail postfix/smtp[8926]: connect to mx3.qq.com[184.105.206.85]:25: Connection timed out
Aug 31 03:20:33 mail postfix/smtp[8926]: connect to mx3.qq.com[2001:df6:f400::2808]:25: Network is unreachable
Aug 31 03:20:33 mail postfix/smtp[8926]: CBCD97F30D: to=<xxxxxxx@qq.com>, relay=none, delay=1625, delays=1503/0.03/122/0, dsn=4.4.1, status=deferred (connect to mx3.qq.com[2001:df6:f400::2808]:25: Network is unreachable)
Aug 31 03:20:33 mail postfix/smtp[8928]: connect to 163mx01.mxmail.netease.com[220.181.14.138]:25: Connection timed out
Aug 31 03:21:03 mail postfix/smtp[8928]: connect to 163mx01.mxmail.netease.com[220.181.14.139]:25: Connection timed out
Aug 31 03:21:03 mail postfix/smtp[8928]: 67BFE7F305: to=<15008472563@163.com>, relay=none, delay=1998, delays=1847/0.02/152/0, dsn=4.4.1, status=deferred (connect to 163mx01.mxmail.netease.com[220.181.14.139]:25: Connection timed out)

这些ip都可以ping通,但telnet无法连接
telnet: Unable to connect to remote host: Connection timed out

==== 必填信息。没有填写将不予回复 ====
- iRedMail 版本号：iRedMail-0.9.7-1
- 使用哪个数据库存储用户帐号（OpenLDAP，MySQL，PostgreSQL）：MySQL
- 使用的 Linux/BSD 发行版名称及版本号：CentOS 6.4
- 与您的问题相关的日志信息：
====

foxmail中出现的错误

错误信息：Please check the email <dingjun@mail.feitun.com>, server reply: 504 5.5.2 <chenliwin10>: Helo command rejected: need fully-qualified hostname

日志信息
tail /var/log/maillog

ep  5 22:55:14 mail postfix/postscreen[4866]: CONNECT from [192.168.0.186]:21646 to [192.168.0.224]:25
Sep  5 22:55:14 mail postfix/postscreen[4866]: PASS OLD [192.168.0.186]:21646
Sep  5 22:55:14 mail postfix/smtpd[4867]: connect from chenliwin10[192.168.0.186]
Sep  5 22:55:14 mail postfix/smtpd[4867]: Anonymous TLS connection established from chenliwin10[192.168.0.186]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
Sep  5 22:55:14 mail postfix/smtpd[4867]: NOQUEUE: reject: RCPT from chenliwin10[192.168.0.186]: 504 5.5.2 <chenliwin10>: Helo command rejected: need fully-qualified hostname; from=<chenli@mail.feitun.com> to=<dingjun@mail.feitun.com> proto=ESMTP helo=<chenliwin10>
Sep  5 22:55:15 mail postfix/smtpd[4867]: disconnect from chenliwin10[192.168.0.186]

按照某个帖子解决办法，发件服务器选中SSL，服务器根本没有反应，感觉服务器端的465端口没打开。

帮忙看看，谢谢张工。

但是同样的设置(imap:993,ssl，smtp:587)在网易邮箱大师却可以通过，并能正常收发邮件，就是网易的邮箱大师没有新邮件提醒，所以想在手机qq邮箱里面设置一下，但是总是报这个错误，改了很多次端口，都不行，麻烦张工给看看，谢谢了！！

端口说明如下：
POP3 service: port 110 over TLS (recommended), or port 995 with SSL.
IMAP service: port 143 over TLS (recommended), or port 993 with SSL.
SMTP service: port 587 over TLS.

哪里有什么465啊
https://docs.iredmail.org/index.html

在阿里云安装0.9.8无法外发邮件，设置域名有错，先在想重新安装一遍，但是不知道怎么卸载 网上找的资料提示是clear_iredmail.sh 但是并未找到这个脚本 希望大大 可以帮忙

Sep 12 14:32:31 mail postfix/postscreen[2076]: CONNECT from [183.15.178.80]:32606 to [172.18.70.222]:25
Sep 12 14:32:31 mail postfix/postscreen[2076]: PASS OLD [183.15.178.80]:32606
Sep 12 14:32:41 mail postfix/smtpd[2083]: connect from unknown[183.15.178.80]
Sep 12 14:32:41 mail postfix/smtpd[2083]: Anonymous TLS connection established from unknown[183.15.178.80]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
Sep 12 14:32:41 mail postfix/smtpd[2083]: NOQUEUE: reject: RCPT from unknown[183.15.178.80]: 504 5.5.2 <DESKTOP-ANDF9BC>: Helo command rejected: need fully-qualified hostname; from=<wanglei@nlaelpct.com> to=<wanglei1313@qq.com> proto=ESMTP helo=<DESKTOP-ANDF9BC>
Sep 12 14:32:44 mail postfix/smtpd[2083]: disconnect from unknown[183.15.178.80]
Sep 12 14:33:12 mail postfix/postscreen[2076]: CONNECT from [183.15.178.80]:32993 to [172.18.70.222]:25
Sep 12 14:33:12 mail postfix/postscreen[2076]: PASS OLD [183.15.178.80]:32993
Sep 12 14:33:22 mail postfix/smtpd[2083]: connect from unknown[183.15.178.80]
Sep 12 14:33:22 mail postfix/smtpd[2083]: Anonymous TLS connection established from unknown[183.15.178.80]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
Sep 12 14:33:22 mail postfix/smtpd[2083]: NOQUEUE: reject: RCPT from unknown[183.15.178.80]: 504 5.5.2 <DESKTOP-ANDF9BC>: Helo command rejected: need fully-qualified hostname; from=<wanglei@nlaelpct.com> to=<wanglei1313@qq.com> proto=ESMTP helo=<DESKTOP-ANDF9BC>
Sep 12 14:33:24 mail postfix/smtpd[2083]: disconnect from unknown[183.15.178.80]
Sep 12 14:34:06 mail postfix/postscreen[2076]: CONNECT from [103.7.29.139]:16750 to [172.18.70.222]:25
Sep 12 14:34:12 mail postfix/postscreen[2076]: PASS OLD [103.7.29.139]:16750
Sep 12 14:34:16 mail postfix/postscreen[2076]: warning: dnsblog reply timeout 10s for b.barracudacentral.org
Sep 12 14:34:16 mail postfix/postscreen[2076]: warning: dnsblog reply timeout 10s for zen.spamhaus.org
Sep 12 14:34:16 mail postfix/dnsblog[2241]: warning: dnsblog_query: lookup error for DNS query 139.29.7.103.b.barracudacentral.org: Host or domain name not found. Name service error for name=139.29.7.103.b.barracudacentral.org type=A: Host not found, try again
Sep 12 14:34:16 mail postfix/dnsblog[2244]: warning: dnsblog_query: lookup error for DNS query 139.29.7.103.zen.spamhaus.org: Host or domain name not found. Name service error for name=139.29.7.103.zen.spamhaus.org type=A: Host not found, try again
Sep 12 14:34:22 mail postfix/smtpd[2083]: connect from unknown[103.7.29.139]
Sep 12 14:34:23 mail postfix/smtpd[2083]: Anonymous TLS connection established from unknown[103.7.29.139]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
Sep 12 14:35:24 mail postfix/smtpd[2083]: NOQUEUE: reject: RCPT from unknown[103.7.29.139]: 450 4.7.1 <smtpbg64.qq.com>: Helo command rejected: Host not found; from=<wanglei1313@qq.com> to=<wanglei@nlaelpct.com> proto=ESMTP helo=<smtpbg64.qq.com>
Sep 12 14:35:25 mail postfix/smtpd[2083]: disconnect from unknown[103.7.29.139]
Sep 12 14:35:35 mail postfix/qmgr[1614]: 1B4D940096: from=<wanglei@nlaelpct.com>, size=1620, nrcpt=1 (queue active)
Sep 12 14:35:45 mail postfix/smtp[2370]: 1B4D940096: to=<281492950@qq.com>, relay=none, delay=10994, delays=10984/0.04/10/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=qq.com type=MX: Host not found, try again)

看这里：
http://www.iredmail.org/docs/errors.html

重装系统再安装 iRedMail。这是最快最干净的办法。

smtp 验证没有打开。打开后不会有这种错误信息。

端口和对应的安全连接类型在文档首页有注明：
http://www.iredmail.org/docs/#mua

有问题时要检查 iRedMail 服务器上的 log，这样才是最原始最准确的信息，方便排错。QQ 之类的可能为了便于用户理解，会将内容略作修改，导致我们技术人员无法准确排错。