I can understand typos, but if your spelling is atrocious use a spell checker, it won't catch everything i.e. then vs. than or their vs. there, but it will catch obvious mistakes. In addition to that regardless of how educated you are not taking the time to check your work makes you look like an imbecile. Now that said, if your primary language is not English it is understandable that you might have several problems with the grammar, but with a spell checker most of your words should be spelled correctly. I have seen spam that was more coherent and had better spelling than these emails.
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