Failed to authenticate on SMTP server error using gmail

Did you turn on the "Allow less secure apps" on? go to this link

https://myaccount.google.com/security#connectedapps

Take a look at the Sign-in & security -> Apps with account access menu.

You must turn the option "Allow less secure apps" ON.

If is still doesn't work try one of these:

• Go to https://accounts.google.com/UnlockCaptcha , and click continueand unlock your account for access through other media/sites.

• Use double quote in your password: "your password"

And change your .env file

MAIL_DRIVER=smtpMAIL_HOST=smtp.gmail.comMAIL_PORT=587MAIL_USERNAME=dianexxxxx@gmail.comMAIL_PASSWORD=xxxxxxMAIL_ENCRYPTION=tls

because the one's you have specified in the mail.php will only be used if the value is not available in the .env file.

Nothing wrong with your method, it's a G-mail security issue.

1. Login g-mail account settings.

2. Enable 2-step verification.

3. Generate app-password.

4. Use new-generated password in place of your real g-mail password.

Don't forget to clear cache.

php artisan config:cache.php artisan config:clear.MAIL_DRIVER=smtpMAIL_HOST=mailtrap.ioMAIL_PORT=587MAIL_USERNAME=yourgmailid@gmail.comMAIL_PASSWORD=generatedAppPasswordMAIL_ENCRYPTION=tls

If you still get this error when sending email: "Failed to authenticate on SMTP server with username "youremail@gmail.com" using 3 possible authenticators"

You may try one of these methods:

1. Go to https://accounts.google.com/UnlockCaptcha, click continue and unlock your account for access through other media/sites.

2. Using a double quote password: "your password" <-- this one also solved my problem.