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Advocacy emails
(slrpnk.net)
A place to discuss the news and latest developments on the open-source browser Firefox
That domain appears to be associated with createsend who do bulk email.
I'm guessing that it's used to track who is clicking on a link.
I agree, seems a bit off for Mozilla to use such a process, but getting emails from the sender to each recipient is no longer trivial if you're doing it in bulk.
That's a great point. I helped set my employer up for a campaign once. Can't have too many hyperlinks, can't use certain words like "free", and IIRC can't use a domain in links that doesn't match originating domain. Too many points against and the destination server chucks it in the bin.