I'm currently hosting my domain using mydomain.com. All the email is send through to one account (catch all). A few addresses are forwarded to other adresses. But i cannot disable one account. I want to use a new email adress whenever i register at any website, f.i. if i sign up for yahoo i want to use the email adress yahoo.com@mydomain. If an email adress starts to receive spam, i want to be able to disable that specific email address, so the spam bounces and to be able to enable it whenever i want. Does anyone know a way how i can to this? Any suggestions are more than welcome...

Since you're using catch all, I don't think you can make email bounce to any specific address.

The only solution that I think might work would be to use procmail to process all the emails.

You can filter certain email address and trash it in the /dev/nul

When you want to set something like that up, it is best to either:

*NOT* set up a catch-all (as it will catch everything), rather set up one account and set up aliases as needed to that one account. All other mail should be bounced. If that alias gets spam, you remove that alias and all mail going to that alias would be bounced.

or

Use those forwards to forward mail to that main account, and the forward name gets spam, change the address it forwards to and send it off to never never land somewhere.