A useful feature to have would be the ability to change a message
before it is forwarded on to your real email address. Three examples
come to mind: prepend the subject line, prepend the message body, and
append to the message body. These could be used to help you identify
messages or for sorting/filtering rules you might have. As an example,
if you had an email forwarder set up for the amazon.com website, you
could have a small note ( such as AMAZON ) prepended to original
subject line. You could then have a filter setup at your real email
address provider, that directs all emails with a subject line starting
with AMAZON to be redirected to a specific folder, The prepending
header option and appending footer option would be used to contain
notes on the account or other information.