postfix map source

(please talk to me like I'm a newbie)

I got this error message when trying to set up virtualmin :

> Failed to save enabled features : A problem was found with your Postfix virtual maps : No map sources were found in the Postfix configuration

What are these map sources, where/how can I get one, on can I feed one to postfix so that it makes VirtualMin happy.

Thanks in advance !

Baudouin

It looks like that correctly used, Google is my friend.

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