The following settings should be used if you need to use Gmail as an outgoing server for email notifications:
Note that you should specify an existing Gmail account that will be used as a sender for all the notifications.
If Gmail detects some excessive outgoing activity it may block your account for being potentially dangerous. At the same time Gmail will provide you with instruction on how to add Comindware Tracker to trusted sources. If that happens, follow those instructions to ensure correct work between Gmail and Comindware Tracker.