How to extend a mailing lists upon receive of inactive notification?

For mailing list that has been idled for 12 months, email notification with subject "Expiration of inactive mailing lists" will be send to list owners. You can just simply click the link in the message within 30 days in order to extent your list.

In case you forgot to do the extension and received the second notification telling that your list will be closed within 24 hours, you may just search for the first email notification and click on the link in order to extent your list. You may also logon to the lists manager and modify any of your list settings in order to reset the inactivity timer.