I would like to include the parameter

&bcc=[user's Email to Salesforce address]

in a custom URL button (or Javascript for that matter).  I find no documentation for a user field representing the user's Email to Salesforce address, leading me to suspect it is not accessible via the API or for use as a merge field like this.

Has anyone succeeded in incorporating the Email to Salesforce address into a custom button or a Visualforce page?