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This template produces something like User5 (talk • contribs • email). If the username has a space (or possibly other characters), then you must provide parameter 2 for the "global" link to work - the username again, but URL-encoded. If you don't, it will default to the username as entered in parameter 1. This will work only for usernames without those characters. Nevertheless, you'll be able to enter the username and hit "search" on the global contribs page even if the link is broken, so all is not lost.