Pop Peeper is not the most fancy program but it is very complete and handy. I review here the complete solution with plugins.
The program is very interesting for security purpose and anti-spam features with the ability to create complex rules (Reg Ex).
Monitoring and alarm for new mails are efficient and clean.
The ability to use Pop Peeper as a mail program is great too. You can answer and write mails (there is an automatic email completion based on the people you already wrote to), it keeps in eml format all mail with search ability. So it is very handy to answer quickly or create a little mail without using your main mail program.
The – : encoding for written messages does not manage correctly French special characters.
– options are not intuitive to reach (it may be hidden in plugins options) and spam management can be too complex for users searching for simplicity.