Its possible to check if an email is a lnaddress by looking up the .well-known. I don't know if this can be automated under android without directing all emails through your lightning wallet and redirecting it to email client if it isn't a lightning address.

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Maybe the same way we tag someone now with @, a character could be used before the address to mark it as lightning

Thats what matrix does and its a little disorienting. They chose email format for a reason.