see: postfixadmin#468 - token docs on possible migration

DOCUMENTS/Migration.md

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+# Migrating to Postfixadmin from other products
+
+## From Postfix
+
+Where a database structure like this exists :
+
+See also: https://github.com/postfixadmin/postfixadmin/issues/468
+
+
+```SQL
+
+CREATE TABLE `virtual_domains` (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  `name` varchar(50) CHARACTER SET latin1 NOT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB AUTO_INCREMENT=29 DEFAULT CHARSET=latin1 COLLATE=latin1_german1_ci;
+
+CREATE TABLE `virtual_aliases` (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  `domain_id` int(11) NOT NULL,
+  `source` varchar(40) CHARACTER SET latin1 NOT NULL,
+  `destination` varchar(80) CHARACTER SET latin1 NOT NULL,
+  PRIMARY KEY (`id`),
+  KEY `domain_id` (`domain_id`),
+  CONSTRAINT `virtual_aliases_ibfk_1` FOREIGN KEY (`domain_id`) REFERENCES `virtual_domains` (`id`) ON DELETE CASCADE
+) ENGINE=InnoDB AUTO_INCREMENT=465 DEFAULT CHARSET=latin1 COLLATE=latin1_german1_ci;
+
+CREATE TABLE `virtual_users` (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  `domain_id` int(11) NOT NULL,
+  `user` varchar(40) CHARACTER SET latin1 NOT NULL,
+  `password` varchar(32) CHARACTER SET latin1 NOT NULL,
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `UNIQUE_EMAIL` (`domain_id`,`user`),
+  CONSTRAINT `virtual_users_ibfk_1` FOREIGN KEY (`domain_id`) REFERENCES `virtual_domains` (`id`) ON DELETE CASCADE
+) ENGINE=InnoDB AUTO_INCREMENT=114 DEFAULT CHARSET=latin1 COLLATE=latin1_german1_ci;
+
+```
+
+## Possible route
+
+You'll need to modify the below to match how your mailboxes are stored on disk (the maildir).
+
+It assumes the password hash format is compatible. If not some sort of blanket reset is probably required.
+
+### Migrate domains
+
+`insert into domain (domain, description, transport) select name, name, 'virtual' from postfix_legacy.virtual_domains;`
+
+### Migrate users 
+
+` insert into mailbox (username, password, name, maildir, local_part, domain) select concat(user, '@', d.name), password, user, concat(d.name, '/', user), user, d.name FROM postfix_legacy.virtual_users INNER JOIN postfix_legacy.virtual_domains d ON postfix_legacy.virtual_users.domain_id = d.id;`
+
+### Migrate Aliases
+
+`insert into alias (address, goto, domain) select concat(a.source, '@', d.name), a.destination, d.name FROM postfix_legacy.virtual_aliases a INNER JOIN postfix_legacy.virtual_domains d ON d.id = a.domain_id;`