A nonessential but always present aspect of spam is its usage mistakes. Spammers do occasionally include intentional misspellings in order to skirt around e-mail filters that flag certain keywords, but most of the mistakes spammers make are not strategic, and this explanation cannot excuse the atrocious grammar. Mostly, spam is horribly written because it comes from lowlifes and swindlers operating in the dregs of capitalism.
Here's an excerpt from a so-called Nigerian scammer:
I am the personal attorney / sole executor to the WILL of my late client ? I have a message for you please return my mail for details.Your Respond should be sent to my Private e-mail.
These few lines contain countless mistakes that aren't even worthwhile pointing out. When has clearly written, error-free spam message ever shown up in anyone's inbox? For all spam, the poor quality of the writing reflects the intent behind the senders' schemes and ethics.