Dear,
At the moment we don't send automated mails when a new version is available. This is however something we are working on for the future. We are also working on an auto-update feature, which we hope to make available at the end of this year.
In the application, there is also an update check under Configuration\Your Lansweeper License.
To follow up on new releases, you can also consult our changelog: Changelog - Lansweeper