I see hundreds of badly-spelt, badly punctuated business communications in the course of my work, and in many cases the grammar is horrendous.
We're creating a nation of poor communicators - people who think that it doesn't matter how badly you write, or how poor your vocabulary. We're lucky enough to have the most expressive language in the world - capable of conveying the most complex and subtle concepts and emotions - and we're quietly allowing it to atrophy. Children are being allowed to grow to adulthood without having read the books so necessary to the development of a rich vocabulary and to the ability to express themselves in any real sense - why bother, when you can text everyone and get information from the internet and TV? The thought of sitting all afternoon with a good book is anathema to the average child.
That's why your email was so badly written - the sender knew no better.