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Hi cleverjake, I'm the developer of this service at Mailgun.

You can't actually register "email with spaces"@gmail.com or "very.unusual.@.unusual.com"@mail.yahoo.com with Google or Yahoo.

Both addresses pass pure syntax checks but then the validator kills it when it notices that Google or Yahoo won't let you register addresses like that.

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So it would be valid if I entered "very.unusual.@.unusual.com"@mail.zikes.me, assuming I created that address on my mailserver?

Hi Zikes, that's actually a bug, thanks for finding it. I'll fix it, and yes, that will soon be marked as valid.

Hey russ, Yeah, I know you couldn't on gmail or yahoo, but I didn't know that you are using domain specific rules. Thats great!

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