使用frp透传软件搭建本地运行的私有邮箱服务器

起因：随着我公司在线应用软件的增多，比如wordpress、 next cloud、SuitCRM 、iFair等，许多场合都要求填写邮箱地址，绑定邮箱。因为不想将过多的数据存储于第三方空间，因此考虑在公司局域网内搭建一个私有的电子邮箱服务器，再通过公司域名，实现功能的透传。

零、用到的服务器环境介绍

0.1 外网固定ip的vps

Debian12 最小化安装，frps 0.53.2, nginx , 假设绑定的域名 www.abctest.com   mail.abctest.com

该vps上运行了 公司的官方网站，采用的是html5 + CSS 编写的静态单页网站，结合私有ssl证书，通过 https://www.abctest.com 访问。

0.2 局域网搭建的iRedMail邮箱服务器

Debian12 最小化安装，frpc 0.53.2

一、邮件服务器的搭建

1.1  假设域名： abctest.com   邮箱服务器： mail.abctest.com

这里服务器环境为Debian12最小化安装；邮箱服务器采用可交互式安装的 iRedMail，安装过程可以参考官网；安装的过程中，选择使用了PostgreSQL数据库，密码假设为： Abctest888；要求设置邮箱域，输入  abctest.com 即可；还要求设邮箱管理员[email protected] 的密码，这里假设为 Abctest888 

1.2  安装完成后如何进入邮箱：

  这里假设邮件服务器在本地局域网的ip为 192.168.1.250

管理员模式登录：
* - iRedMail Admin: https://192.168.1.250/iredadmin
管理员账号：[email protected]  密码：Abctest888

普通用户模式登录  
* - Roundcube webmail: https://mail.abctest.com    ## 默认的webGUI
* - SOGo groupware: https://mail.abctest.com/SOGo/ ## SOGo登录GUI

1.3  安装完成后可以查看服务器的总体配置

1.3.1  基本配置如下

cat iRedMail-1.6.8/config


export STORAGE_BASE_DIR='/var/vmail'
export WEB_SERVER='NGINX'
export BACKEND_ORIG='PGSQL'
export BACKEND='PGSQL'
export VMAIL_DB_BIND_PASSWD='s9SmJbOlKpPzm5T8j5qDrxobekuDbpvL'
export VMAIL_DB_ADMIN_PASSWD='IhSdIIPzbzSSXUK0BfMM5rKmtri0qPsk'
export MLMMJADMIN_API_AUTH_TOKEN='qBQyzRCwHEOvRAYlhja5tAaXhhmBXQh4'
export NETDATA_DB_PASSWD='yx0nFXuiWJs7D26xeVCwZw4RAdjEtnCA'
export PGSQL_ROOT_PASSWD='Abctest888'
export FIRST_DOMAIN='abctest.com'
export DOMAIN_ADMIN_PASSWD_PLAIN='Abctest888'
export USE_IREDADMIN='YES'
export USE_ROUNDCUBE='YES'
export USE_SOGO='YES'
export USE_NETDATA='YES'
export USE_FAIL2BAN='YES'
export AMAVISD_DB_PASSWD='tPpwOzq33oVMISgktgS3f55IeRTWjKKz'
export IREDADMIN_DB_PASSWD='EVIH8ZTsCDv3jbowtmSMEd94LLDAkVtW'
export RCM_DB_PASSWD='y9lMIKGYsjtwE07MTIsZU1EzTbGIDZyT'
export SOGO_DB_PASSWD='21NHY4yp1Yjw1qkeF4mZ2EBzBlzKW5JM'
export SOGO_SIEVE_MASTER_PASSWD='QfnTNbkQmfSn965EnGiyNzysGO3shnou'
export IREDAPD_DB_PASSWD='7QcVfbX0QTSi0Lprxisefp1YIOtdmYxn'
export FAIL2BAN_DB_PASSWD='9D4j3twgaQTS06ioSluhPeXHPnELI2kI'
#EOF

1.3.2 安装完成后的邮箱服务器信息如下

cat iRedMail-1.6.8/iRedMail.tips


Admin of domain abctest.com:

    * Account: [email protected]
    * Password: Abctest888

    You can login to iRedAdmin with this account, login name is full email address.

First mail user:
    * Username: [email protected]
    * Password: Abctest888
    * SMTP/IMAP auth type: login
    * Connection security: STARTTLS or SSL/TLS

    You can login to webmail with this account, login name is full email address.

* Enabled services:  rsyslog postfix postgresql nginx php8.2-fpm dovecot clamav-daemon amavis clamav-freshclam sogo memcached fail2ban cron nftables


SSL cert keys (size: 4096):
    - /etc/ssl/certs/iRedMail.crt
    - /etc/ssl/private/iRedMail.key

Mail Storage:
    - Mailboxes: /var/vmail/vmail1
    - Mailbox indexes:
    - Global sieve filters: /var/vmail/sieve
    - Backup scripts and backup copies: /var/vmail/backup

PostgreSQL:
    * Admin user: postgres, Password: Abctest888
    * Bind account (read-only):
        - Name: vmail, Password: s9SmJbOlKpPzm5T8j5qDrxobekuDbpvL
    * Vmail admin account (read-write):
        - Name: vmailadmin, Password: IhSdIIPsacSSXUK0BfMM5rKrtmi0qPsk
    * Database stored in: /var/lib/postgresql/15/main
    * RC script: /etc/init.d/postgresql
    * Config files:
        * /etc/postgresql/15/main/postgresql.conf
        * /etc/postgresql/15/main/pg_hba.conf
    * Log file: /var/log/postgresql/
    * See also:
        - /root/iRedMail-1.6.8/runtime/pgsql_init.pgsql
        - /var/lib/postgresql/.pgpass

SQL commands used to initialize database and import mail accounts:
    - /root/iRedMail-1.6.8/runtime/*.sql

Postfix:
    * Configuration files:
        - /etc/postfix
        - /etc/postfix/aliases
        - /etc/postfix/main.cf
        - /etc/postfix/master.cf

    * SQL/LDAP lookup config files:
        - /etc/postfix/pgsql

Dovecot:
    * Configuration files:
        - /etc/dovecot/dovecot.conf
        - /etc/dovecot/dovecot-ldap.conf (For OpenLDAP backend)
        - /etc/dovecot/dovecot-mysql.conf (For MySQL backend)
        - /etc/dovecot/dovecot-pgsql.conf (For PostgreSQL backend)
        - /etc/dovecot/dovecot-used-quota.conf (For real-time quota usage)
        - /etc/dovecot/dovecot-share-folder.conf (For IMAP sharing folder)
    * Syslog config file:
        - /etc/rsyslog.d/1-iredmail-dovecot.conf (present if rsyslog >= 8.x)
    * RC script: /etc/init.d/dovecot
    * Log files:
        - /var/log/dovecot/dovecot.log
        - /var/log/dovecot/sieve.log
        - /var/log/dovecot/lmtp.log
        - /var/log/dovecot/lda.log (present if rsyslog >= 8.x)
        - /var/log/dovecot/imap.log (present if rsyslog >= 8.x)
        - /var/log/dovecot/pop3.log (present if rsyslog >= 8.x)
        - /var/log/dovecot/sieve.log (present if rsyslog >= 8.x)
    * See also:
        - /var/vmail/sieve/dovecot.sieve
        - Logrotate config file: /etc/logrotate.d/dovecot

Nginx:
    * Configuration files:
        - /etc/nginx/nginx.conf
        - /etc/nginx/sites-available/00-default.conf
        - /etc/nginx/sites-available/00-default-ssl.conf
    * Directories:
        - /etc/nginx
        - /var/www/html
    * See also:
        - /var/www/html/index.html

php-fpm:
    * Configuration files: /etc/php/8.2/fpm/pool.d/www.conf

PHP:
    * PHP config file for Nginx:
    * Disabled functions: posix_uname,eval,pcntl_wexitstatus,posix_getpwuid,xmlrpc_entity_decode,pcntl_wifstopped,pcntl_wifexited,pcntl_wifsignaled,phpAds_XmlRpc,pcntl_strerror,ftp_exec,pcntl_wtermsig,mysql_pconnect,proc_nice,pcntl_sigtimedwait,posix_kill,pcntl_sigprocmask,fput,phpinfo,system,phpAds_remoteInfo,ftp_login,inject_code,posix_mkfifo,highlight_file,escapeshellcmd,show_source,pcntl_wifcontinued,fp,pcntl_alarm,pcntl_wait,ini_alter,posix_setpgid,parse_ini_file,ftp_raw,pcntl_waitpid,pcntl_getpriority,ftp_connect,pcntl_signal_dispatch,pcntl_wstopsig,ini_restore,ftp_put,passthru,proc_terminate,posix_setsid,pcntl_signal,pcntl_setpriority,phpAds_xmlrpcEncode,pcntl_exec,ftp_nb_fput,ftp_get,phpAds_xmlrpcDecode,pcntl_sigwaitinfo,shell_exec,pcntl_get_last_error,ftp_rawlist,pcntl_fork,posix_setuid

ClamAV:
    * Configuration files:
        - /etc/clamav/clamd.conf
        - /etc/clamav/freshclam.conf
        - /etc/logrotate.d/clamav
    * RC scripts:
            + /etc/init.d/clamav-daemon
            + /etc/init.d/clamav-freshclam

Amavisd-new:
    * Configuration files:
        - /etc/amavis/conf.d/50-user
        - /etc/postfix/master.cf
        - /etc/postfix/main.cf
    * RC script:
        - /etc/init.d/amavis
    * SQL Database:
        - Database name: amavisd
        - Database user: amavisd
        - Database password: tPpwOzq33oVMISgktgS3f55IeRTWjKKz

DNS record for DKIM support:

; key#1 2048 bits, s=dkim, d=abctest.com, /var/lib/dkim/abctest.com.pem
dkim._domainkey.abctest.com.        3600 TXT (
  "v=DKIM1; p="
  "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAs9BKQ0Q821NN1IC8FbzC"
  "3Uq1XGF/10xypU6LUZpNudmvqApCAQDXcyvMIiYwFhejtMdeLbk+qbywuiHGRs3Y"
  "OlJ/fGTTgIUL8qx3IfxEjtvvsU90fi94721+1kCKy7SyFHXgkyjlRTUXkUnF3HplIV6"
  "TWlXBp9GvpSXW5ZNfBG3zFM2NZTt3A8psKbHs6FQyZ6Z7fMi+cKEktRrg2e4P2kx"
  "wfJ25W+FGTVI//H1AsE3ZfjV+RQj1rjB2d5Vpls1SZCA3Q6nqc5lDufPxnmviC9F"
  "VvjN3K9XcF9beSCV3oTgQUz6PRNuli7/5TMkTUP/DqigodyQqubARdMFPDNn3+pX"
  "JQIDAQAB")
SpamAssassin:
    * Configuration files and rules:
        - /etc/mail/spamassassin
        - /etc/mail/spamassassin/local.cf

iRedAPD - Postfix Policy Server:
    * Version: 5.3.3
    * Listen address: 127.0.0.1, port: 7777
    * SQL database account:
        - Database name: iredapd
        - Username: iredapd
        - Password: 7QcVfbX0QTSi9Lprxisekl1YIOtdmYvz
    * Configuration file:
        - /opt/iredapd/settings.py
    * Related files:
        - /opt/iRedAPD-5.3.3
        - /opt/iredapd (symbol link to /opt/iRedAPD-5.3.3

iRedAdmin - official web-based admin panel:
    * Version: 2.5
    * Root directory: /opt/www/iRedAdmin-2.5
    * Config file: /opt/www/iRedAdmin-2.5/settings.py
    * Web access:
        - URL: https://mail.abctest.com/iredadmin/
        - Username: [email protected]
        - Password: Abctest888
    * SQL database:
        - Database name: iredadmin
        - Username: iredadmin
        - Password: EVIH8ZTsCDa9jbowtmSMEd63LLDAkVtW

Roundcube webmail: /opt/www/roundcubemail-1.6.5
    * Config file: /opt/www/roundcubemail-1.6.5/config
    * Web access:
        - URL: http://mail.abctest.com/mail/ (will be redirected to https:// site)
        - URL: https://mail.abctest.com/mail/ (secure connection)
        - Username: [email protected]
        - Password: Abctest888
    * SQL database account:
        - Database name: roundcubemail
        - Username: roundcube
        - Password: y5lMIKGYsjtwE07MTIsZU2EzTbGIDZyT
    * Cron job:
        - Command: "crontab -l -u root"

SOGo Groupware:
    * Web access: httpS://mail.abctest.com/SOGo/
    * Main config file: /etc/sogo/sogo.conf
    * Nginx template file: /etc/nginx/templates/sogo.tmpl
    * Database:
        - Database name: sogo
        - Database user: sogo
        - Database password: 75NHY4yp1Yjw1qkeF3mZ2EBzBlzKW0JM
    * SOGo sieve account (Warning: it's a Dovecot Master User):
        - file: /etc/sogo/sieve.cred
        - username: [email protected]
        - password: QfnTNbkQmfSn371EnGiyNzysGO8shnou
    * See also:
        - cron job of system user: sogo

netdata (monitor):
    - Config files:
        - All config files: /opt/netdata/etc/netdata
        - Main config file: /opt/netdata/etc/netdata/netdata.conf
        - Modified modular config files:
            - /opt/netdata/etc/netdata/go.d
            - /opt/netdata/etc/netdata/python.d
    - HTTP auth file (if you need a new account to access netdata, please
      update this file with command like 'htpasswd' or edit manually):
        - /etc/nginx/netdata.users
    - Log directory: /opt/netdata/var/log/netdata
    - SQL:
        - Username: netdata
        - Password: yx4nFXuiWJs9D38xeVCwZw1RAdjEtnCA
        - NOTE: No database required by netdata.

1.4 管理员登录界面和普通用户登录界面

二 、frp 软件的设置 

可参考我的两篇文章

frp透传软件最新toml格式的配置文件的使用_frpc toml设置-CSDN博客

利用frps搭建本地自签名https服务的透传_frp配置ssl-CSDN博客

假设我们的域名服务器就是frps服务器，也就是  www.abctest.com

2.1 frps.toml的配置

cat /etc/frp/frps.toml

bindPort = 7777
vhostHTTPSPort = 443
vhostHTTPPort = 8080

2.2 frpc.toml的配置

主要是对 邮箱服务所需的特定端口进行绑定，类型都是tcp

 cat /etc/frp/frpc.toml

serverAddr = "www.abctest.com"
serverPort = 7777

[[proxies]]
name = "ssh-250"
type = "tcp"
localIP = "127.0.0.1"
localPort = 33250
remotePort = 33250

[[proxies]]
name = "web-250"
type = "https"
localPort = 443
customDomains = ["mail.abctest.com"]

[[proxies]]
name = "smtp-250"
type = "tcp"
localPort = 25
remotePort = 25

[[proxies]]
name = "submission-250"
type = "tcp"
localPort = 587
remotePort =587

[[proxies]]
name = "pop3-250"
type = "tcp"
localPort = 110
remotePort =110

[[proxies]]
name = "pop3s-250"
type = "tcp"
localPort = 995
remotePort =995

[[proxies]]
name = "imap-250"
type = "tcp"
localPort = 143
remotePort = 143

[[proxies]]
name = "imaps-250"
type = "tcp"
localPort = 993
remotePort = 993

三、 服务端nginx对域名 mail.abctest.com 的自动转发

因为外网vps运行的是 frps以及一个官网网页，所以已经占据了80端口和443端口，要想实现对 https://mail.abctest.com 的转发，需要新增一个 nginx 虚拟机的配置。配置文件内容如下

 cat /etc/nginx/conf.d/mail.conf

server {
        listen      80 ;
        listen      [::]:80 ;
        server_name mail.abctest.com;
        rewrite ^/(.*)$ https://mail.abctest.com:443/$1 permanent;
        #               location / {
        #  proxy_pass http://127.0.0.1:443;
        # }
    }

局域网内 iRedMail服务器的 nginx设置

将  /etc/nginx/sites-enabled/{00-default-ssl.conf，00-default.conf} 这两个配置文件中 的  server_name 配置上 mail.abctest.com  即可！！

重启vps和本地iRedMail 服务器上的 nginx

连接测试一下