Gmail Error: Password not accepted from server [SOLVED]

Found a good solution today if you’re receiving the following error:

SMTP -> ERROR:Password not accepted from server. Code: 535 Reply: 535-5.7.1 Please log in with your web browser and then try again.

Even if the Gmail account credentials are correct, Google’s servers may still block the server attempting to authenticate (more than likely due to a new server location and/or recent password change).

Firts, you need allow a sign-in attempt from your device:  https://myaccount.google.com/security#activity

To get around this, make sure you are logged in using the same Gmail account in your browser, and then simply open the link below and step through the process of verification:

https://accounts.google.com/b/0/DisplayUnlockCaptcha

This will allow access to your Gmail account for about 10 minutes so that a new authenticating server can be detected.  Be sure to try authenticating again within this time period.

Your mail app might not support the latest security standards. Learn how to allow less secure apps access to your account. https://www.google.com/settings/u/0/security/lesssecureapps
Make sure your mail app isn't set to check for new email too frequently. If your mail app checks for new messages more than once every 10 minutes, the app’s access to your account could be blocked.
Try changing your password according to our tips on creating a strong password.
If using CPanel(WHM)
Login to CPanel > Tweak Settings > All> "Restrict outgoing SMTP to root, exim, and mailman (FKA SMTP Tweak)" <== disable it