If you are trying to make MySQL backups in Virtualmin that create individual time-based folders like
12-11-2009
13-11-2009
…
You can turn on strftime substitution in the module config for MySQL in Webmin. This is off by default.
Here is the screen shot:

Cheers and happy new year to everyone
If you are getting the following error:
Failed to create virtual server : Mailman cannot be enabled unless the administration list mailman has been created.This can be done in the Mailman plugin module.
I had just came across a solution that I have tried and verified to be working from tidiar on the Amazon Web Services Developer Community. The link to the thread is http://developer.amazonwebservices.com/connect/entry.jspa?externalID=767

Click on the Network Configuration link

Click on the Hostname and DNS Client

Set the Hostname field to your EC2 instance external address
Thereafter just head to Virtualmin Mailman Mailing Lists in webmin, if mailman does not exist, you will find a block that looks like this:

This block will show if the default mailman is not created
Fill in an administration username and password. You can leave the Associate with Domain to
Hit “Create” and you are done.
You should see the following box appear on top now:

After default mailman has been created
You can now enable mailman mailing lists when you create your virtual websites under virtualmin and you should not get the error anymore.
Again credits to tidiar on AWS forums for sharing the solution.
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