Advanced email address rewrite

I am trying to convert from sendmail to postfix, and I am down to one
last hold-up. I need to convert incoming emails from
"me_*@mydomain.com", to "me+*@mydomain.com", where * is an arbitrary
word. For example, "me_usenet@home.com" becomes "me+usenet@home.com".
I have this working in sendmail with some very ugly .cf rules, but I
can't quite figure out how to do this with postfix. Any suggestions
would be very helpful.

Thanks,
Mark

P.S. If anyone is interested, I use this so I can hand out different
email addresses to different services. I can then reject particular
addresses that end up overwhelmed by spam. I use me_* instead of me+*
as many service won't accept email address with a plus sign. There are
probably better ways of doing this, but I have been handing these out
for years.

On Jan 29, 7:21 pm, mark_newuse...@peculier.com wrote:
> ...
> "m...@mydomain.com", to "m...@mydomain.com", where * is an arbitrary
> word. For example, "me_use...@home.com" becomes "me+use...@home.com".
> ...

It looks like my mail reader is trying to protect my email addresses.
The above (without the domain name) should have read:

convert "me_*" to "me+*" where * is an arbitrary word
for example: "me_usenet" becomes "me+usenet"