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When I get an email, there is a header From: in the actual MIME message that specifies who the sender of the email is.
I notice that the format of that particular header is sometimes:
From: user@domain.com
or
From: Human Readable Name <user@domain.com>
Are these the only ways that standard clients format the From: header? Or are there others I should be aware of?
They are documented in RFC 5321 and RFC 5322.
And you may also be interested in RFC 2047.