Virtualmin Postfix Error:

The status of your system is being checked to ensure that all enabled features are available, that the mail server is properly configured, and that quotas are active ..

      A problem was found with your Postfix virtual maps : No map sources were found in the Postfix configuration

.. your system is not ready for use by Virtualmin.

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Solution

1.) Make sure postfix is started:
service postfix start
*It takes awhile to start.
2.)In Webmin Click Servers->Postfix Mail Server (this takes a few minutes to load).
3.)Go to Virtual Domains (near top left).
Set "Map specifications" to hash:/etc/postfix/virtual

Click -> Save And Apply



The Read User Mail module is not setup to use the Postfix mail server. Either adjust its module configuration to match, or change the Virtualmin configuration.

Servers -> Read User Mail -> Module Config:
*System configuration
Mail server installed : Set to Autodetect


Quotas are not enabled on the filesystem / which contains home directories under /home and email files under /var/spool/mail. Quota editing has been disabled.