Send copy of incoming email to

Question

Does anyone know how to configure the mail server to Send copy of incoming email to a specified email. Thank you!
e.g. I got 3 colleagues in support team and their email addresses are [email protected], [email protected] and [email protected] Any email send to their addresses will be sent a copy to [email protected]
Thank you!

Answer 1

You need to set up a forwarder in the postfix system used by OS X Server to handle mail.
It is quite straightforward to set this up if you are familiar with using command line / terminal to configure your machine.  If you are not sure about this mode of using OS X Server, you may need to find an alternative method.
Assuming you logged into the server as an Administrator, the way to do it is as follows:
1) On your server, open a terminal window and switch into 'super user' mode by typing su at the prompt.  You will be asked to give the password for your account, and if successful you'll see the command prompt change (from something ending in a $ sign to something else ending in a # sign) 
2) Open the file virtual_users in the directory /Library/Server/Mail/Config/postfix for editing.  I use nano - but you can use whatever editor you prefer for this - e.g.
nano /Library/Server/Mail/Config/postfix/virtual_users
3) In this file (which is probably blank / empty when you start) type in the following information for each of your users that you are trying to forward mail from (obviously you'll need to correct the email addresses first!)
[email protected]    [email protected]    [email protected]
[email protected]     [email protected]    [email protected]
[email protected]   [email protected]    [email protected]
4) Now you need to process the file to put it in a form that postfix can read, do so by typing in the following
postmap /Library/Server/Mail/Config/postfix/virtual_users
5) Now you need to restart postfix so that it uses your new settings
postfix reload
6) Now just type exit into the terminal to leave SU mode and you are done.  Test your email addresses, but it should "just work".
The clever bit is the postfix virtual_users file. 
In that file, you put the email address you want to play with first on the line, and then you can put as many other email addresses after it (with spaces between): postfix will forward messages sent to the first address to each of the addresses in the list. 
Most normally this system is used to set up 'forwarding' systems - so if you want one email to go to another this is what you do.  But if you want to do this and keep a copy, simply repeat the original email (i.e. the one at the start of the line) in the list that follows, and a copy goes to that one too.  Postfix is clever enough to not get into a tail-spin - it doesn't loop back and send a copy of the copy or anything.
Hope this helps.