Postfix mail log with Subject line - Parallel Plesk Panel

We need mail subject in our Logs when we manage several domains with lots of mail IDs for better mail troubleshooting,

For postfix, normally don't have setting for mail log with subject line. But we have do it with simple trick on postfix configuration. Just follow bellow steps, It wont affect any off your mail services, but your log storage will increase some amount.

1. Open your postfix config file with your favoret text editor, mine always vim

vim /etc/postfix/main.cf

2. Find bellow line and un comment it, if commented.

header_checks = regexp:/etc/postfix/header_checks

3. Open file /etc/postfix/header_checks with your editor

vim /etc/postfix/header_checks

4. Add bellow line and save,

/^Subject:/     INFO

5. Restart postfix

service postfix restart

Send mail from your webmail and verify log by following comment. 

tail -f /var/log/maillog | grep Subject

For Plesk,

tail -f /usr/local/psa/var/log/maillog | grep Subject

Note " | grep Subject" used to filter only subject line, you can remove it as per your needs

Import Plesk mails to WHM cPanel mails - vice versa

Before start to the solution, I'll explain my situation,

I've 2 servers with Parallels Plesk - 11.5.30 and WHM - 11.50. Plesk have Postfix mail server and WHM have exim mail server.

My task is to migrate a domain example.com from Plesk installed server to WHM installed server.

Now I've moved files to new server, But how can I move mails from Plesk to WHM. It's really hard thing to do, because both have different mail server.

After lot of reference, I can see that horde will help on this.

Okay, Let's see what is Horde, It is a webmail client, slimier to squirrelmail, roundcube mail etc. It is used to check our mails on server with web interface.

So how it help us to import mails that located in server with Plesk control panel to server with WHM control panel.

Trick

1. How to Enable Horde web-mail on plesk.

Login in to your Plesk control panel, click "Tools & Settings" on left menu, click "Updates and Upgrades" under Panel, new window will open, click Add/Remove Components, on list under "Plesk webmails support" select "Horde web-mail support", if not selected and click remove another one. It'll take few min to install.

2. In WHM control panel, we don't have to do much work because by default there is option to choose our web-mail client.

3. Login in to Horde Web-mail client on plesk server, Right click Inbox, click Export. It'll ask to download file, use default option and click ok.

4. MBOX file will be downloaded.

5. Login to web-mail on WHM server, as same Right click and choose Import. It'll ask for mbox file, choose downloaded file.

6. It'll take few some time based on your mails count and size.

That's it.

Advantages:
It's very quick method to import, no need any configuration changes.

Disadvantages:
It's too hard if we have large amount of mail boxes.