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In 100% of cases, this is either because someone copied a bad regexp, or they made an explicit decision to not allow local-part wildcarding.

I have in the past normalized email addresses per the rules I know specific providers have to help people login. Did I sign up with mike+hn@ or mike+hackernews@?

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I sign up with your website @ my website.

For example: ycombinator.com@example.com.

Nobody blocks dots in email addresses, although I have had some sites in the past email me using the first part of my email address as my name; it's amusing to open an email from example.com saying "Hi, example.com!"

Funny, that's exactly how I do it! One of the reasons is, I know who lost/leaked/sold my data when the spam starts coming in. (Of course today we also have haveibeenpwned.)

Store email and username (if applicable) in password manager alongside the password.

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