When I log in to my Spamgourmet account and view the list of my disposable addresses, I see all my disposable addresses except for one. Ticking the 'show hidden addresses' checkbox doesn't fix it.
I know that I created that particular disposable address because I have emails in my inbox saying that the email was sent to that address, and I just tried sending a test email to that address and I successfully received that email.
So it should be in the list of my disposable addresses, but isn't. Any clue why?