For years the lowly dot in gmail addresses didn't matter. You could be joshua@ and jo.sh.ua@ all the same and your email would reach you. This had some uses when filtering mail in various systems. Though I've not found an announcement of the change and Google is littered with links that say otherwise it appears from testing this morning with several domains that dots or periods, whatever you may call them, do matter but only if you're using Google Apps.
by Joshua Brauer on June 27, 2012