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"Mail Update for Mavericks can't be installed on this disk. This volume does not meet the requirements for this update." WTF?

There were two GMs. I guess you're running the first one. Update to the second GM (aka the public release, 13A603) and you'll be fine.

I have 13A017. That means for some reason, I have a later release? I didn't download any developer seeds.

Also, the Mail update installed file for me.

pooriaazimi: "Update to the second GM (aka the public release, 13A603) and you'll be fine."

Check those numbers. In my book, 017 < 603 (in both decimal and octal :-))