There is no special configuration needed. Please ignore all rumors to the effect that you need to create an IMAP configuration file.
Drivers are code modules that support different mailbox storage technologies.
By default, all drivers are enabled. There is little benefit to be gained by disabling a driver, with one exception. It is also possible to add your own drivers and authenticators. This is a topic for wizards, and is beyond the scope of this text. However, it all depends upon how and where your SMTP server delivers mail.