If the configuration has been done (by Basis) to allow the emails to go out of the SAP system then anyone with authorization should be able to go to SOST and manually select a line (or several lines) and then click Process button. This should send an email out from SAP.
If the system is not configured for the email sending then you're right - Basis assistance is needed.
This seems rather simple, so I'm confused - what exactly is the question?