HP Email Firewall Appliance manual Glossary

GLOSSARY

Attachment Control A feature that allows you to block attachments based on their extension or MIME type.

BCC Blind Carbon Copy. The copy of an email is sent to a specified address without the other recipient’s knowledge.

Certificate An attachment to a message that verifies its origin.

Certificate Authority A centralized organization that verifies and issues digital certificates.

(CA)

DCC Distributed Checksum Clearinghouse. An anti-spam technology that uses message checksums derived from email received from all over the Internet to determine whether messages are considered bulk mail.

DNS Domain Name System. This system maps a numerical Internet Protocol (IP) address to a more meaningful and easy-to-remember name. When you need to access another device on your network, you enter the name of the device, instead of its IP address.

ESMTP Extended SMTP. A set of extensions for the SMTP (Simple Mail Transport Protocol) for better multimedia message handling.

FTP File Transfer Protocol. A protocol based on TCP/IP for reliable file transfer.

HELO The initial identifying message sent when setting up an SMTP connection between two email servers.

HTTP Hypertext Transfer Protocol. This is a set of rules for exchanging files (text, graphic images, sound, video, and other multimedia files) on the World Wide Web.

HTTPS A secure version of HTTP using SSL (Secure Sockets Layer) encryption.