I created a new disposable address when signing up at a website. They send confirmation emails and I waited for mine but it never arrived. Normally, when this has happened in the past, the disposable address is never created and that points to a problem on their end. But this time, the address was created and I see 2 sent (the first confirmation email, I assume, and the second request I made for a new one when the first didn't arrive). So the emails made it through the spamgourmet system but never arrived in my inbox.
Just to get the obvious out of the way:
All of my other disposable addresses are working fine.
No messages are getting spam filtered in any other way.
A test email I sent to the disposable address in question from another account (not my protected address) arrived just fine and the message count said 3 of 20.
How can I find out what happened to the other 2 emails? What information should I provide to track down the problem and to whom should I give it? (I was going to follow the template in the sticky but that seemed to be for a different type of scenario).