changing the From:/Reply-to: header to match the To: header when replying

[mabs]

is there any way that I can do what I have said in the subject?

eg, an email comes into my mailbox (mabs), which was forwarded from webmaster,
and when I reply, I would like the From: header to change to webmaster, how can
I achive this?

I have tried:
send-hook '~f ^mabs@atdot\.org$' 'my_hdr From: Marcus B <[EMAIL PROTECTED]>'
but obviously, it doesn't work...

P.S. I am not on the mail list, so, please CC me