OK. Well that isn't a bug in either Gmail or Launchpad. It's a handy (but potentially troublesome) feature in Gmail, and it's perfectly legitimate behaviour from Launchpad.
[email protected] is not the same address as [email protected], so you can't expect Launchpad to let both of those addresses through. What if, say, Yahoo didn't do what Gmail does, and you registered [email protected]? Someone else could register [email protected] (and if that's taken, any of the other 2^11 possibilities, excluding the possibilities where multiple periods appear in a row) and then impersonate you, either as a social engineering attack (pretend to be you to a human and hope they don't notice the period) or to trick Launchpad (if Launchpad allowed any address with the same letters but different distribution of periods). It is therefore good that Launchpad doesn't let you do this. Gmail on the other hand is not following standards precisely, but it's hardly bad behaviour. Essentially, they just gave you 2^11 free email addresses. You can think of it as them having reserved all of the other 2^11 possibilities so that nobody can use them to socially engineer on your behalf. This doesn't necessarily mean you can use all of them interchangeably wherever you go; just that you have all of them available to you to use as distinct email addresses. Anyway, if you register both of them in Launchpad, then Launchpad will accept either (since you may have multiple addresses attached to each Launchpad account).
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