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.
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. It is also possible to add your own drivers and authenticators.