It is very important to make sure you haven't any anti-virus software scanning the mail port while eMail Bounce Handler is working and downloading large amount of bounces. This is because the software use to be faster than the anti-virus.
In addition it is also important that eMail Bounce Handler is the very only application connected to the mailbox containing the bounces. Make sure you other mail software is not interfering.
eMail Bounce Handler is a bounce e-mail filtering and handling tool that recognizes bounce e-mails using a customizable set of rules and extracts the recipients addresses allowing you to use them again to try sending your mail or to take them off your list.
eMail Bounce Handler simply connects to your POP or IMAP mailbox in order to retrieve bounces letting any other message untouched.