Since the message is going to be transmitted at the Speed of Light, the sender has a few extra moments to construct a better and more meaningful letter. E-mail will save anywhere from two to five days time compared to regular US Mail. We should all slow down and take a little extra time. It makes a better impression on the receiving end. Most E-mail servers have these features and they should be used, because we know it takes way too much time to look at the Dictionary anymore.
Nothing makes a worse impression than poor grammar and misspelled words.
A poorly written, or abbreviated E-mail sends the message that the sender didn't care enough about the recipient to bother wasting any time on him or her. He who hesitates is not lost, check it again. If so, it never hurts to also print out the letter on good quality stationery and mail it as well as E-mailing it. Many people make the mistake of CC'ing too many people and letting the other names show. If not, some of the recipients will get upset because their E-mail addresses have been exposed to others without their consent.