what is ur first word when writing a mail

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HEY that wat most pple rite on them mail and u find that most of them dont rely ave a good title to start a mail..like hallo ..sir but i think it a habit most pple rite wat is short for tthem and a HEY IS ENOUGH even me i find that every mail i rite it will start with a hey ... some start with ..whats up..." which is not so polite in ..and every one has his own funny way off starting his or her mail . wat do u start with?????????/