Why do I see a Propel spinner when sending emails with Outlook?

Why do I see a Propel spinner when sending emails with Outlook, even if I have not connected them to a pitch?

Whenever you click the send button in an email, Propel needs to check if the email you are sending is a pitch or not. The spinner appears while Propel is checking.
An email is considered a pitch if you selected a pitching initiative from the sidebar or if you are replying to an existing pitch. If you are not sending a pitch (you did not select a pitch from the sidebar), nothing further happens, and the email is sent normally as though you did not have Propel. On the other hand, if you have selected a pitch, Propel sees this and adds open tracking and a story funnel card.