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| H |
| Header -
The part of an email message that is usually not displayed in the email client. The email header contains meta-data and routing information such as the identity and IP addresses of the sender and recipient as well as all email gateways in between the sender and the recipient and the email's priority and subject line. Some spammers deliberately manipulate the header information in an attempt to fool (or spoof) spam filters as to the actual source of the email message.
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