nPOP is a free portable (USB Memory, Floppy Disk) email client to manage email messages. You can access email on a POP3 mail server setup on the computer or pocket PC.
Receiving of email has support for POP3 and APOP, while sending email has support for SMTP and SMTP-AUTH and POP before SMTP. You can configure multiple accounts and check automatically check for new email messages. It also support simple address book, dial-up management, filters for routing received e-mail (anti-spam).