Does anyone know how i change the address that appears on emails i send based on the address that the email i am replying to came to?

For example, lets say someone emails me@domain.com which is setup as a forward when i reply to that message, is there a way that i can reply and have it automagically show my email address as lee@mydomain.com ?

Right now its showing my isp email address when i respond to an email but i want to have that address 'hidden' so it isnt spammed.

Regards,

Lee