Interesting -- well, I found it interesting -- article on what constitutes a valid email address. I did not know:
Quote:
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The RFC is rather specific here, and mandates that the local part MUST BE treated as case sensitive.
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I wonder if there are any email providers who would allow
USER@domain.tld and
user@domain.tld to point to different inboxes.
For the full article:
https://www.netmeister.org/blog/email.html