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I found a handful! Good luck with the whole convincing-google-you-aren't-spamming thing. I don't know if it fits your use case, but I've had good luck with using amazon's simple email service for sending email verification emails and notifications and whatnot. it is ridiculously cheap -- you get x,xxx free a month or something so i don't think i've ever paid for it. sometimes it's nice to just make that bit someone else's problem :)