About the one you are referring to, the letter i is in small letter and not in capital letter
Real: @t47inaugural.com
Fake: @t47lnaugural.com (with a lowercase “L” replacing “I”)
If real email is in capital letter, it will be harder to know the real one from the fake one because I (i) is harder to differentiate from l (L).
This is the format hackers used to scam multinational companies off their mailbox, they simply hack the mail, clone the name of mail that wants to do business with the other companies and hide the real negotiator away from the business discussion. This format is very popular and it's hard to detect too because the difference in letter and alphabet is hidden a little bit.