HOW DO I INSTALL/TEST IT?

To install Mail::POP3Client:

% perl Makefile.PL
% make
% make test
% make install

NOTE: if you want to test against a real mailbox, set the environment
variable POPTESTACCOUNT to some POP3 account in the following format:
user:password:host.

% export POPTESTACCOUNT=jsmith:secret:pop3.my.do.main
% make test