Postfix email setup for multiple domain droplet

Question

Having not been able to find a suitable answer in the forum yet, I thought I’d try to put a new question forward.

Email has been working for domain1.com very well on a droplet (with hostname mail.domain1.com) for a few months now. I want to move domain2.com (same droplet) off of Google Apps and into Thunderbird alongside domain1.com.

To my main.cf I’ve added:

virtual_alias_domains = domain1.com domain2.com
virtual_alias_maps = hash:/etc/postfix/virtual
mydestination = mail.domain1.com, domain1.com, localhost, localhost.localdomain
#only the last of the above line added, first three have been working fine

To the virtual file I added:

user@domain2.com user

And done ‘add user’ to ensure that user mailbox was created.

To the DNS of domain2.com I removed Google records and added:

mx 1 mail.domain1.com

Do I need to add another A record to domain2.com DNS, the same as domain1.com, which has the ‘A mail IP’ and ‘A @ IP’ records, or are they going to be picked up from domain1.com?

The DNS records have propagated in the DO control panel, but Google are still picking up email from both domains now, with none being forwarded to the server. It has only been 20 or so minutes, however. I will wait another 20 minutes before posting this to see if it has worked.

[…]

20 minutes later, it is working. Emails are still being forwarded to the Google account, but perhaps there are some servers that still need updating somewhere along the chain? Will report back in a few hours if this is still the case.

[UPDATE: Separate issue now, but it seems that emails are still being forwarded to my personal Gmail account, despite not appearing in the Google Apps account. I had the Apps account forward messages to my personal account, from where I’d ‘reply as’ the Apps address. It worked well for years, so wasn’t a problem.

But seems there’s something in the mechanism now that still thinks when I write from the Gmail account to domain1 or domain2 it should be forwarded back to itself. Mails from domain1 to domain2 are safely staying out of Gmail for now, but I’ll go into Apps and remove the forwards, see if that does it. There must be an underlying connection between Apps and Gmail making that happen - in any case this is a Google issue now, so I’ll leave it there.]

In the intervening 20 minutes I removed localhost.domain from the ‘mydestination’ line of main.cf and double checked that I had done:

postmap /etc/postfix/virtual
sudo /etc/init.d/postfix reload

To be sure I’d covered all bases. Happy to report it’s a working config.

Anyone stuck can hopefully use the above as a reference!

System

postfix/dovecot
ubuntu

rocksstaradi · Answer

Can anybody guide me about the postfix configuration…? I have 2 domains in 1 droplet. Lets say, domain1.com & domain2.com . Domain1 points to Gsuite mail server (through MX) and domain2 points to Zoho (through their MX). I have set these values correctly in respective DNS section. But still now can’t able to send/receive emails in domain based email a/c (for both domains) from both of my website’s contact form. Any help will be highly appreciated. Thanks

JonsJava · Answer

I went the database route:

Install Postfix
Install and configure MySQL
(optional for PostfixAdmin) Install the rest of the LAMP stack

create user named “vmail”

adduser vmail -u 5000 -d /var/mail/vhosts -s /sbin/nologin
mkdir -p /var/mail/vhosts
chown -R vmail:vmail /var/mail/vhosts

edit /etc/postfix/main.cf

below “mynetworks”:

virtual_mailbox_domains = mysql:/etc/postfix/mysql-domains.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql-users.cf
virtual_alias_maps = mysql:/etc/postfix/mysql-aliases.cf
virtual_mailbox_base = /var/mail/vhosts
virtual_minimum_uid = 5000
virtual_uid_maps = static:5000
virtual_gid_maps = static:5000

in /etc/postfix/mysql-domains.cf:

hosts = 127.0.0.1
user = DB_USER_GOES_HERE
password = DB_PASSWORD_GOES_HERE
dbname = DB_NAME_GOES_HERE
table = domain
select_field = domain
where_field = domain
additional_conditions = and backupmx = '0' and active = '1'
#query = select domain from domain where domain = '%s' and active = 1

in /etc/postfix/mysql-users.cf:

hosts = 127.0.0.1
user = DB_USER_GOES_HERE
password = DB_PASSWORD_GOES_HERE
dbname = DB_NAME_GOES_HERE
table = mailbox
select_field = maildir
#where_field = username
#additional_conditions = and active = '1'
query = select maildir from mailbox where username = '%s' and active = 1
result_format = %sMaildir/

in /etc/postfix/mysql-aliases.cf:

hosts = 127.0.0.1
user = DB_USER_GOES_HERE
password = DB_PASSWORD_GOES_HERE
dbname = DB_NAME_GOES_HERE
table = alias
select_field = goto
where_field = address
additional_conditions = and active = '1'

the schema for the database:

--
-- Table structure for table `admin`
--

DROP TABLE IF EXISTS `admin`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `admin` (
  `username` varchar(255) NOT NULL,
  `password` varchar(255) NOT NULL,
  `created` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `modified` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `active` tinyint(1) NOT NULL DEFAULT '1',
  PRIMARY KEY (`username`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='Postfix Admin - Virtual Admins';
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `alias`
--

DROP TABLE IF EXISTS `alias`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `alias` (
  `address` varchar(255) NOT NULL,
  `goto` text NOT NULL,
  `domain` varchar(255) NOT NULL,
  `created` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `modified` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `active` tinyint(1) NOT NULL DEFAULT '1',
  PRIMARY KEY (`address`),
  KEY `domain` (`domain`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='Postfix Admin - Virtual Aliases';
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `alias_domain`
--

DROP TABLE IF EXISTS `alias_domain`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `alias_domain` (
  `alias_domain` varchar(255) NOT NULL,
  `target_domain` varchar(255) NOT NULL,
  `created` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `modified` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `active` tinyint(1) NOT NULL DEFAULT '1',
  PRIMARY KEY (`alias_domain`),
  KEY `active` (`active`),
  KEY `target_domain` (`target_domain`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='Postfix Admin - Domain Aliases';
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `config`
--

DROP TABLE IF EXISTS `config`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `config` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(20) NOT NULL DEFAULT '',
  `value` varchar(20) NOT NULL DEFAULT '',
  PRIMARY KEY (`id`),
  UNIQUE KEY `name` (`name`)
) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=latin1 COMMENT='PostfixAdmin settings';
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `domain`
--

DROP TABLE IF EXISTS `domain`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `domain` (
  `domain` varchar(255) NOT NULL,
  `description` varchar(255) CHARACTER SET utf8 NOT NULL,
  `aliases` int(10) NOT NULL DEFAULT '0',
  `mailboxes` int(10) NOT NULL DEFAULT '0',
  `maxquota` bigint(20) NOT NULL DEFAULT '0',
  `quota` bigint(20) NOT NULL DEFAULT '0',
  `transport` varchar(255) NOT NULL,
  `backupmx` tinyint(1) NOT NULL DEFAULT '0',
  `created` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `modified` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `active` tinyint(1) NOT NULL DEFAULT '1',
  PRIMARY KEY (`domain`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='Postfix Admin - Virtual Domains';
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `domain_admins`
--

DROP TABLE IF EXISTS `domain_admins`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `domain_admins` (
  `username` varchar(255) NOT NULL,
  `domain` varchar(255) NOT NULL,
  `created` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `active` tinyint(1) NOT NULL DEFAULT '1',
  KEY `username` (`username`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='Postfix Admin - Domain Admins';
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `domains`
--

DROP TABLE IF EXISTS `domains`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `domains` (
  `domain` varchar(50) NOT NULL,
  PRIMARY KEY (`domain`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `fetchmail`
--

DROP TABLE IF EXISTS `fetchmail`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `fetchmail` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `mailbox` varchar(255) NOT NULL,
  `src_server` varchar(255) NOT NULL,
  `src_auth` enum('password','kerberos_v5','kerberos','kerberos_v4','gssapi','cram-md5','otp','ntlm','msn','ssh','any') DEFAULT NULL,
  `src_user` varchar(255) NOT NULL,
  `src_password` varchar(255) NOT NULL,
  `src_folder` varchar(255) NOT NULL,
  `poll_time` int(11) unsigned NOT NULL DEFAULT '10',
  `fetchall` tinyint(1) unsigned NOT NULL DEFAULT '0',
  `keep` tinyint(1) unsigned NOT NULL DEFAULT '0',
  `protocol` enum('POP3','IMAP','POP2','ETRN','AUTO') DEFAULT NULL,
  `usessl` tinyint(1) unsigned NOT NULL DEFAULT '0',
  `extra_options` text,
  `returned_text` text,
  `mda` varchar(255) NOT NULL,
  `date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `forwardings`
--

DROP TABLE IF EXISTS `forwardings`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `forwardings` (
  `source` varchar(80) NOT NULL,
  `destination` text NOT NULL,
  PRIMARY KEY (`source`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `log`
--

DROP TABLE IF EXISTS `log`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `log` (
  `timestamp` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `username` varchar(255) NOT NULL,
  `domain` varchar(255) NOT NULL,
  `action` varchar(255) NOT NULL,
  `data` text NOT NULL,
  KEY `timestamp` (`timestamp`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='Postfix Admin - Log';
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `mailbox`
--

DROP TABLE IF EXISTS `mailbox`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `mailbox` (
  `username` varchar(255) NOT NULL,
  `password` varchar(255) NOT NULL,
  `name` varchar(255) CHARACTER SET utf8 NOT NULL,
  `maildir` varchar(255) NOT NULL,
  `quota` bigint(20) NOT NULL DEFAULT '0',
  `local_part` varchar(255) NOT NULL,
  `domain` varchar(255) NOT NULL,
  `created` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `modified` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `active` tinyint(1) NOT NULL DEFAULT '1',
  PRIMARY KEY (`username`),
  KEY `domain` (`domain`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='Postfix Admin - Virtual Mailboxes';
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `quota`
--

DROP TABLE IF EXISTS `quota`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `quota` (
  `username` varchar(255) NOT NULL,
  `path` varchar(100) NOT NULL,
  `current` bigint(20) DEFAULT NULL,
  PRIMARY KEY (`username`,`path`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `quota2`
--

DROP TABLE IF EXISTS `quota2`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `quota2` (
  `username` varchar(100) NOT NULL,
  `bytes` bigint(20) NOT NULL DEFAULT '0',
  `messages` int(11) NOT NULL DEFAULT '0',
  PRIMARY KEY (`username`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `transport`
--

DROP TABLE IF EXISTS `transport`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `transport` (
  `domain` varchar(128) NOT NULL DEFAULT '',
  `transport` varchar(128) NOT NULL DEFAULT '',
  UNIQUE KEY `domain` (`domain`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `users`
--

DROP TABLE IF EXISTS `users`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `users` (
  `email` varchar(80) NOT NULL,
  `password` varchar(20) NOT NULL,
  PRIMARY KEY (`email`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `vacation`
--

DROP TABLE IF EXISTS `vacation`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `vacation` (
  `email` varchar(255) NOT NULL,
  `subject` varchar(255) CHARACTER SET utf8 NOT NULL,
  `body` text CHARACTER SET utf8 NOT NULL,
  `cache` text NOT NULL,
  `domain` varchar(255) NOT NULL,
  `created` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `active` tinyint(1) NOT NULL DEFAULT '1',
  PRIMARY KEY (`email`),
  KEY `email` (`email`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='Postfix Admin - Virtual Vacation';
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `vacation_notification`
--

DROP TABLE IF EXISTS `vacation_notification`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `vacation_notification` (
  `on_vacation` varchar(255) CHARACTER SET latin1 NOT NULL,
  `notified` varchar(255) CHARACTER SET latin1 NOT NULL,
  `notified_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`on_vacation`,`notified`),
  CONSTRAINT `vacation_notification_pkey` FOREIGN KEY (`on_vacation`) REFERENCES `vacation` (`email`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='Postfix Admin - Virtual Vacation Notifications';
/*!40101 SET character_set_client = @saved_cs_client */;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

finally, to easily manage it, install PostFixAdmin (PFA):

http://postfixadmin.sourceforge.net/

Question

Postfix email setup for multiple domain droplet

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