Validity Period Expiration Date
If you receive an email like the one below from your Plesk system stating that a domain you host is about to expire within Plesk, follow the solution outlined below to resolve the issue.

Example
The validity period of domain 'domain.com', owned by user account 'admin' (Contact name 'John Doe') is about to expire. The domain and all of its services will be deactivated unless the validity period is prolonged. 

Solution
By default this is set to one year. You can set this to more than one year or unlimited even if you wish. To make this change use the following instructions.

For Plesk 9.x
1. Login to Plesk Control Panel

2. From the domains list, select the domain the warning is about

3. From Under the Statistics Menu options select Resource Usage

4. Scroll down to the bottom of the page and set the desired value for the "Validity period Expiration date" and click OK.