(moderator - please delete this thread once the message has been passed on to the spamgourmet developers, to avoid spammers getting ideas).
Once spammers discover spamgourmet or similar sites, they could just simply create endless numbers of random "email addresses" using your base user name.
For example, if your username is "bobpatterson" which forwards email to "bobpatterson@hotmail.com".
Then a spamming programme, once it knows that your username is "bobpatterson" could send emails to the following email addresses:
xyz21381.20.bobpatterson@spamgourmet.com
asdfjl213.20.bobpatterson@spamgourmet.com
sdfds.20.bobpatterson@spamgourmet.com
43430sdfd.20.bobpatterson@spamgourmet.com
Of course - the first part doesn't matter, since spamgourmet recognizes only the "20.bobpatterson@spamgourmet.com" to forward emails to "bobpatterson@hotmail.com". So the spammers only have to make up random characters in the prefix to send spam to bobpatterson@hotmail.com.
What do you guys think?