This function is only available in the Enterprise Solution.
To create an email connector, choose the option when creating a new connector. This is an active connector. You will then be asked to select your desired email protocol. You can configure emails with the protocols IMAP, POP3 and SMTP:
Depending on which one you select, different fields will appear, which you have to fill out. All three protocols have encrypted connections with SSL and StartTLS. In SMTP connectors, you can use the button to check if the connector is working.