I get asked this a lot from older people, or for legal matters. They want to forward an email message they've received to another party, while removing any identifying information from the first party - as well as removing some lines from the body of the original email. The most convenient way of doing this is pressing "forward" on your email client, and then backspacing the stuff you don't want.
What are the implications of doing this, considering:
The work is often being done to a HTML email message , using a WYSIWYG editor (ex. gmail, yahoo, outlook)
Do message headers or other data "follow" when you press forward?
In general, is there a best practice for copy/pasting information from a confidential source (e.g., another email, an internal document) without bringing in additional information accidentally?
I tend to paste everything into a plain-text editor first, because I don't know what an email client does behind the scenes. Is this overly paranoid?