Each POPxxxxx.PND file is the configuration file for one POP3 host and each SMTxxxxx.PND file is the configuration file for one SMTP host. They are viewable with a text editor which is how you would determine which host a file belongs to.
Each POPxxxxx.PND file is the configuration file for one POP3 host and each SMTxxxxx.PND file is the configuration file for one SMTP host.  They are viewable with a text editor which is how you would determine which host a file belongs to.