No way to configure SMTP url when username contains an @

My SMTP login requires as the username my full email address, so including the @. However Django seems to use the @ as a way to split the authentication info from the url and port, and thus fails with such a connection string. I tried changing the symbol to an url encoded variant (%40) but that doesn't seem to work, I'm guessing it just uses the username as is and obviously then it is wrong.

So how can I configure the email connection string when the username has a @ in it?