as you probably already know, BugTrakker was made by Mu Tek
BugTrakker
They changed to a different site:
old mutek, redirecting and from what I can see on the new one are just interested in enterprise solutions now.
Offhand, based on what I see, I would say:
1. Can it be used with an email address that is not POP3
but is at your domain and redirects to a default address?
no. Just on the PZ account.
2. Can you disable the confirmation etc. messages so they are not sent? I would like to do this so I can manually build my white/black/ignore lists without alerting whoever is on the other end I am using BoxTrapper.
no - think that is how they 'trap' spammers.
3. Is there a good, preferably detailed with FAQ, site with information about this? I searched Google but didn't have much luck. I just found a bunch of forums with questions posted about it but none that wanted to know what I am asking.
since you've googled, you know the Mu Tek area is pretty dead. I'll keep looking, but think unless you find an archive, not much chance of that.
Please be sure to take my answers as educated guesses, since I don't have the faq on it either.
Sorry