bbs.spamgourmet.com

I've been trying to send an email from one of my disposable addresses to a gmail address. After pasting the spamgourmet-generated address into gmail's TO: field and sending, i get a mailer-daemon email saying that Spamgourmet has rejected the recipient.

Any ideas?

Btw, I copied and pasted the recipient's gmail address into spamgourmet to get the generated address to use, so I know the gmail address wasn't mistyped.