Hi,
#1. I have tried installing with Easy WP SMTP using Gmail and it is working fine.
You need to Create an App Password for Gmail: https://devanswers.co/create-application-specific-password-gmail/
Here is the exact configuration you need to add to the plugin settings:
SMTP Host: smtp.gmail.com
Encryption: Use SSL encryption
SMTP Port: 465 (this should automatically appear when you select SSL encryption)
Auto TLS: Turn off TLS
Authentication: Turn on authentication
SMTP Username: Your complete Gmail address, e.g. [email protected] or [email protected]
SMTP Password: App password ( Instructions on how to create above)
#2. If you use Gmail SMTP Server, please follow guide at https://www.youtube.com/watch?v=_MCxcvfoGj4