Can not send email to smtp.gmail.com from your own domain

[Maxinoha]

Hello,

I'm trying Email Notifier on Raspbery Pi Zero W and I have encountered a problem with its settings. I use Gmail where I have my own xinoha.cz registered domain

When I try to send a test email directly from Raspberry from Python
>>> yagmail.SMTP('octoprint@xinoha.cz').send('m@xinoha.cz', 'subject', 'This is the body')
So the email is successfully delivered, but it is not possible to send the test email from the web interface.

In web interface set:
server: smtp.gmail.com
username: octoprint@xinoha.cz

Sending ends with "Sending failed. Reason::
##
"