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You don't need the dot. Item 12 in the list is "You can have dotless domain names."

indeed, the point the parent comment was making is that effective email validation need not perfectly implement the RFC.

dotless domains are going to be so rare in practice (unless your project has some niche use-case) that you can probably ignore them and call them invalid for the sake of simplicity.

It's worth alerting the user that they likely made a mistake. However, I think they should be allowed to continue with a dotless address.

Do you know many people who own a TLD?

Last time I checked, some of the TLDs did have an MX record. Perhaps they use it for support or something? I could imagine emailing info@tld or admin@tld or support@tld.

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