### Gmail ###
1. Login into Gmail
2. Go to link https://myaccount.google.com/security
3. Enabled your "2-Step Verification" in "Password & sign-in method" section
4. Generate app password on https://security.google.com/settings/security/apppasswords
5. Click "Select app", choose "Other (custom name)". Enter your SMTP name, and click "Generate"
6. The app password is appear, you can save it.
7. Click "Done"

* Gmail SMTP host
   smtp.gmail.com
* Gmail SMTP Port
   TLS: 587
   SSL: 465