...and does your ISP permit SMTP and TLS protocol/port 587?
Here are the settings that worked within the ZD Configure / System section:
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There are times when one has 2-step security verification enabled in your gmail account. The above parameters will not work if one has 2-step verification security enabled. To make it work, disable 2 step verification or go to the Account settings option of your gmail. Within the Account options, select Security. Within Security, select the 2-step verification settings. Then log in and select the App Specific Passwords section tab. Then click on the Manage 'Application-specific passwords' tab. There the SW will generate a password for you to use in the SMTP Authentication password section.
I was able to make the Alarm Email Notification with gmail work with test sucess and emails too however with one change - SMTP Authentication Username i used was "without" @gmail.com. for me 2-step verification was disabled.
I want to set up my Gmail account with the ruckus. I have the same question that is it possible or not. Please help me to resolve this issue. If anyone cannot Recover Gmail Password then they can check their mail to reset password link.