Ran into problems sending email at Line 1579
https://support.google.com/mail/?p=BadCredentials f67sm27801375wmd.0 - gsmtp ....
The problem arises in functions_messenger.php file at line 1579.
There, the content of variable username is OK,
but the content of variable password is " *********** ".
Other situations that we tested: Mass email or e-mail sent to a newly registered user works well.