I see, thanks. So, the lookup is done from the sender's client, not the recipient, correct? I was actually looking at it from the perspective of it was being d

I see, thanks. So, the lookup is done from the sender's client, not the recipient, correct? I was actually looking at it from the perspective of it was being done on the server, rather than the client, and people were concerned about information collection about where they're linking to (or something). This is a good heads up for people with special security needs using proxies to access HTTP. Most people are willing to visit URLs they send in messages from their IP addresses in a browser, or already have before they send the message, but I can see how it's worth knowing about, especially with the additional information disclosure.