Issue Plesk 17 External smartermail notifications

[ben@Fast2host]

Hey guys

I've managed to get notifications to be sent but for some reason, the from address is always the same as the to address.
This causes it either to fail or come through as spam due to SPF. Is there a way of setting the from address as I can't seem to find it. I've set it under external SMTP server under mail in tools and settings to admin@serverhostname but it's still coming from the to address.

Thanks in advance