The first thing I would recommend is double-checking your settings and resubmitting your password under Configuration\Email Alerts, to ensure that this is all correct. Other possible solutions are discussed in
this online topic. Other Gmail users have apparently had this issue due to 2-step verification being enabled, their password no longer passing Google's security standards etc.
If the issue persists, contact support@lansweeper.com and provide:
- Description of the problem.
- Program Files (x86)\Lansweeper\Service\Errorlog.txt, as present on your Lansweeper server.
- Screenshots of any error messages you are seeing.
- Screenshot of the Configuration\Email Alerts page.