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While both tags are popular, I think we should merge mail and email since you can't send a real mail in ubuntu and most questions using mail are often problems in sending or receiving email.
Agreed. Theoretically there might be questions about how to order Ubuntu installation media by postal mail, but since most questions about mail are about email, I think mail should be made a synonym of email.
Mail tag can be used, but now it's widely used wrong.
Perhaps a better description to the mail tag will do the trick.
How do you make the tag code?