I also use sneakemail and spamgourmet but for quick signups- and 419 fun mailcatch is a new favorite. I look forward to trying the RSS feature from within gmail reader and am trying forwarding now.
suggestion: have MC send a short 'hey this is expiring' note to the forwarding target email
I hope this will enable me to receive many more offers for boxes of money, gold dust, dead political family wealth, and lotteries I have never entered in other countries! mwahaha
As for your suggestion, that's quite possible yes. Although I am quite reluctant to have mailcatch send mails on its own, I do not want to add even more spam to the world :)