Google SMTP Email Settings
Server: smtp.gmail.com
User Name: Your Gmail email account
Password: Your Gmail email password
Port: 465 or 587
TLS (SSL): Must be checked
From: Your firm email address <example@yourdomain.com> (must be a valid email address)
Additional Google Email Settings Requirement
Google requires an additional setting to be turned on. From your Gmail account, you must follow these steps to turn on Allow less secure apps.
Click My Account (located in the top-right corner).
Click Sign-in & security.
Scroll down to Allow less secure apps and turn it on.