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email accounts

Help: Old Employees Accessing The Linux Server

I've recently noticed that two of my former employees are still accessing one of our Linux box. Old user account wasn't deleted because it has some important files. How do I make sure account get deleted without losing files and email stored in the account? Can you describe a terminations clearance policy for an employee account including email accounts, forwarding aliases, ssh / ftp, and access to vpn dialup services under Red Hat Enterprise Linux server?
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Q. How do I setup cacth-all email accounts under Postfix MTA? For example if an email send to me@domain.com, info@you.com and sales@you.com, should be sent to the same email address.

This is useful if anyone of user mistypes an email address when they send it to me, or just guesses at a valid email address, then they will likely get an error message from my server such as user / email mail box does not exist. So I wish to set up a "catch all" address

A. Mapping is done using /etc/postfix/virtual file.
# vi /etc/postfix/virtual
Append code as follows, replacing domain and emailusername with actual values:
@yourdomain.com emailusername

Save and close the file. Run following command:
# postmap /etc/postfix/virtual

Also make sure you have following line in /etc/postfix/main.cf file:
virtual_alias_maps = hash:/etc/postfix/virtual

If you just added above, line reload postfix:
# service postfix reload

Caution: if you set up a catch-all email address, you will likely receive more unsolicited (spam) email.