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I use Gmail for all my e-mail needs, but I'd like to be able to compose e-mails in offline situations, like when I'm someplace with no wifi.
I do this with Mail.app, but then when I connect to the Internet Mail tries to download thousands of old e-mails.
How can I set Mail.app—or maybe some superior OSX e-mail app—to allow me to compose and send e-mails but not download/receive them?