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Gerald,

I always understood that dots and some other punctuation are ignored
in email addresses.

No.

So long as it is syntactically correct the email standard leaves the semantic interpretation of the user name part entirely up to the receiving domain.

To get it completely correct Groups.io would need a table of exceptions by domain to know which characters to ignore or otherwise treat specially.

For example, some mail services (IIRC Gmail) allowed the use of a plus sign in an email address to ignore the plus sign and all following characters. This was touted as a cheap way to get disposable email addresses for the purpose of giving different vendors different addresses so as to know which vendor sold you address.

That usage I think inspired Groups.io's use of plus as a command lead-in. As opposed to Y!Groups use of hyphen.

If GIO is considering them different, I guess that could be considered
a bug.

It would be a far worse error to consider them the same with a domain that doesn't. Then you'd have two or more users who can't separate their accounts.

Shal


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