There are currently 1252 questions on SO tagged gmail. There were 7 questions tagged google-mail asked this year, some of which were already tagged gmail as well. I already took the liberty of retagging those to gmail, but I think that google-mail should be a synonym for gmail.
closed as off-topic by Shadow Wizard, bmike, Martijn Pieters, 3ventic, Sompuperoo Sep 22 at 14:23
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