This is risky business and your misunderstanding could cause you to miss out on an opportunity to meet the lover of your dreams. They simply aren't interested in men, so perhaps you shouldn't waste your time. Read or listen as t-girls describe themselves and you will gain insight into exactly where they are in their life and where they intend to go.Others are bisexual (your chances are improving here). A dialog should be able to resolve any remaining questions you might have.
Indeed, many well-intentioned admirers have struck out simply because of a misguided attempt to be friendly.
Good grammar and spelling is important, so don't get sloppy just because you're communicating electronically.
It is also important that you don't give the impression that you're impatient, insincere or desperate.
This is a generic term that fits most t-girls and is rarely offensive.
Whether in person or in writing, making a good first impression is critical for success.