Is it possible to use the email library outside of codeigniter?

Yes I know there's some good packages and classes for SMTP mail, but I'm curious if I can use the Codeigniter email library outside of Codeigniter because I find it easy to use.

If so, how do I do it?

Find all references to other CI classes, functions, and constants that occur in CI_Email and figure out what is needed to convert that reference to run outside of CI which will, in part, require you recursively use this sentence to evaluate each and every reference you find.