Failed to authenticate on SMTP server error using gmail

If you have faced the error which looks like this:

Failed to authenticate on SMTP server with username mygmail@gmail.com using 3 possible authenticators. Authenticator LOGIN returned Expected response code 235 but ...

Then,

Go to https://accounts.google.com/UnlockCaptcha and sign in to that account which you have provided as your gmail id and password in the laravel .env file.

This will unlock your account for access through other media/sites.