License expiration dates can be submitted in the license compliance modules of the Licenses tab. It would then be possible to build a report based on this information and have it sent via email on a scheduled basis. Software expiration dates are stored in the tblLicenses database table. General instructions for setting up email alerts can be found
here.
There are some built-in reports in the Reports tab for asset warranties. Warranty information is automatically scanned for Dell, Fujitsu, HP, IBM, Lenovo and Toshiba assets and can be manually added by hitting the Edit Asset button on asset pages as well. Assets could be created for your domain names as well.