Sending mail using Gmail returns error failed to connect to smtp

[Promzor]

when entering credentials in the ./config/config.dev.yaml file for the iris_smtp
once firing up the sender and creating an incident, the output received is:

File "/home/user1/iris/src/iris/vendors/iris_smtp.py", line 148, in send_email raise Exception('Failed to get smtp connection.') Exception: Failed to get smtp connection.

Example yaml file

• type: iris_smtp
  name: email
  smtp_server: 'smtp.gmail.com'
  smtp_gateway: 'smtp.gmail.com'
  from: 'myemail@gmail.com'
  port: 25
  username: 'username@gmail.com'
  password: 'password'

I tried different port, also changed on googleaccount to allow "unsafe" third party tools to send mails.
I also played with the login information where username entered withouth @gmail.com etc.

[adityavijjanT]

remove smtp_gateway and try.