Maybe it was humor and they forgot the smiley. The anonymity of email seems to make flamewars more likely because the folks involved never get to meet each other and discover that they'd be drinking buddies for life. If you intend to post an angry rebuttal, then wait until tomorrow when your blood pressure will have dropped after a good night's sleep and you'll make a more reasoned reply, if any at all. Even computer communications cost someone money. It's considered gauche and a waste of this money to flame someone for bad spelling.
Most people have screens that can accommodate eighty-character lines.
If lines go over that number, sometimes they wrap onto the next line and sometimes they don't. If you have lines more than eighty characters long, then some folks will literally get only half the message. They're more likely to ignore the message than try to guess the missing text. Stick to the eighty characters per line maximum. Fortunately, most email programs will wrap text to this width.