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I don’t think this would work for users using aliases for their email signups.

In the existing system, myemail+yourservice@domain.com can be verified.

In the proposed reverse method, sending emails from myemail@domain.com, not myemail+yourservice@domain.com, breaks the sign up flow.

This is true for catchall emails where people register using yourservice@domain.com (a forwarding address) but their real address, myemail@domain.com, as well.

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You're right. I'd actually argue (maybe controversially) that this is a feature -- tags and other optional metadata in email addresses are not standardized as unique identities; they're just how Google and a few other email providers have decided to interpret the local part.

That being said, I make use of Google's +-style filtering, so this would also break my own uses :-)

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