Nary a clue as respects IMAP.

But if what you're seeing is similar to the Mail > Prefs > Accounts > Server Settings > Host Name(s) that I see with POP, they look like Internet addresses, in which case I'll guess that they're not case sensitive.


The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire