Chat+ mail notifications not work for me

Hi everybody!

It seems that Chat+ have a good function to send mail to notify users when they are mentioned and receive private message.
I try to configure it with the SMTP parameter in Rocket.chat but without success.
This is log from Chat:
Exception while invoking method 'sendSMTPTestEmail' AuthError: Invalid login - 534-5.7.14

Has anyone successfully make it work?

That error shows you have SMTP Auth failing.

Why not check that you can use SMTP Auth to your SMTP server.

I tried with gmail smtp without success.
I don't have smtp on this server, i can't use the gmail smtp without install postfix?