Mark it with the Red Pen and send it back.

"Your letter has been rejected for a lack of capitalization and the use of the word 'tanuity', which I am unable to find in the dictionary. Google suggests 'tenuity', which relates to 'tenuous', which suggests some interesting connotations that nonetheless do not seem relevant to your message.

"Please rewrite and resubmit your hate-mail, and we will consider it.

"Regards, [etc.]"

*yawns* Great one to wake up to in the morning, btw.