Mail with server not needeing authentication does not work

[tboinski]

Subject of the issue

When a mail server does not require user/password authentication tensorhive cannot connect to it. It always calls for self.server.login(login, password) which fils in such a situation.

Steps to reproduce

Set up a mail server that does not require login and password. Try to send email from tensorhive. The server will fail to login.

Expected behaviour

Tensorhive should not try to authenticate when it is not needed. The configuration should allow setting if authentication is needed and if not should not run self.server.login(login, password).

Actual behaviour

Tensorhive alwys calls self.server.login(login, password) function.