==== Required information ====
- iRedMail version (check /etc/iredmail-release):
- Linux/BSD distribution name and version:
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):
- Web server (Apache or Nginx):
- Manage mail accounts with iRedAdmin-Pro?
- Related log if you're reporting an issue:
================ Required information ====
- iRedMail version 0.95.1
- Linux/BSD distribution name and version: Ubuntu 14.04LTS
- Store mail accounts in which backend mySQL
- Web server (Apache or Nginx):Nginx
- Manage mail accounts with iRedAdmin-Pro? Yes
- Related log if you're reporting an issue:
====

I have a couple of questions on the migration of an old mail server to a new mail server.

1. Export only the data or do export the table structures too

    Do I use the --no-create-info option on the dump command?

mysqldump -uroot -p --no-create-info vmail > mail.sql

   On a test server, the import only worked when I dropped the database on the new server and re-create it with the import, by not using the --no-create-info option.

2. Can I merge the domains from two old mail servers and migrate to a new server?
    This will mean I need to export and import the data only from the two old servers
   
3. Merge /var/vmail mail stores   
Can I use rsync to move the mail messages from /var/vmail from the two old servers to the new server or will it cause problems in the mail store?