I was looking in the Postmill source code to see how IPs get stored.
I just wanted to verify that at the very least this is true according to the publicly-available source of Postmill. Here for example you can see that the ip for a message is only logged if the user is not whitelisted.
x ? y : z means if x then y else z)
This is also the case for Comments, Votes, and Submissions.
I just wanted to provide this information neutrally in a separate thread, because I do think it is very important.
Obviously this does not prove that Raddle does not log IPs of whitelisted users. It could be a custom instance of postmill (IMO very unlikely), the owner of the server could log IPs when they connect to the server and connected to user accounts by examining the requests to the site, and the hosting company could also log IPs. Whether or not this happens is pretty much unverifiable and it ultimately comes down to trust.
I have a couple of proposals related to this:
Modify the user profile page to include whether that user is whitelisted or not. I will personally try to add this functionality myself if people think this is a good idea. EDIT: Just to make this clearer I would try to make it so only the user themself could see whether they are whitelisted or not.
Open Source For the Win, people! This is what I like so much about it. You can see how it works and change it :)