When I forward an email, a table of info is automatically generated in the body of the mail. How can I stop this?

I haven't copied and pasted the full thing, but these are the headers that appear in the table whenever I forward an email. I have to delete the table every time. Can't find a way of changing the default format of a forwarded email to prevent this From: X-Account-Key: X-UIDL: X-Mozilla-Status: X-Mozilla-Status2: X-Mozilla-Keys: Return-path: Envelope-to: Delivery-date: Received: X-Spam-Checker-Version: X-Spam-Level: X-Spam-Status: Received: Received: Received: Received: Received: From: To: Subject: Thread-Topic: Thread-Index: Date: Message-ID: References: In-Reply-To: Accept-Language: Content-Language: X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: x-incomingtopheadermarker: x-ms-exchange-messagesentrepresentingtype: