Poco General FAQ - Is there a list of all headers?

Q: Is there a list of ALL headers available (including the "X" headers)?
 
A:
Some information is available if you are prepared to read the RFC's.

For those less ambitious here's a link to a site that has less technical information.

Note: The "X" headers are defined by the email application and so are not standardized therefore there cannot be a comprehensive list of them. In the case of Poco Slaven couldn't even produce such a list as any script writer could add an "X" header at any time, in fact users can define their own headers via the Optional tab of the Compose window.