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Another fun one is upper case vs lower case. I’ve been bitten by systems that are case sensitive, while the rest of the email world mostly is not.

I could swear I at least once received an email that was sent to myname.mydomain@gmail.com or something similar in my myname@mydomain email. It's been several years but I remember thinking that was fucked up and looking into the full email to see if there was any other explanation for me receiving it, which I did not find.

Google (and most email providers) also treat the user portion as case-insensitive.