The minimum amount of configuration that is needed to enable incoming email is to configure a POP3/IMAPserver.
To do this go into the “Manager” under the “Incoming Email” > “Basic Settings” section and:
Select either “POP3” or “IMAP” from the type field.
Enter the server host and port in the Host & Port field.
Choose whether you need to enable SSL for this host or not.
Click “Save” to persist your changes.
NOTE: Please take into account that at this point Incoming Email is enabled but not activated.