Certified E-mail Plus can be used with any Internet e-mail client program and offers following benefits. Informs a sender when E-mails were received. Informs a sender when E-mails were read. (A receiver should use the Certified E-mail Plus). Check E-mail server periodically whether new E-mails are arrived or not. Check E-mail Virus(I-Worm/ExploreZip, I-Worm.Happy99 and so on). Respond E-mail message automatically.