[awongh]

I think the tone of your communications has to hit a middle ground because I also have a sort of visceral reaction to emails that are too formal:

Dear sir, According to your previous request please refer to the following link to access your download.

Our team thanks you for your kind attention.

Yours warmly, blah blah blah

Somewhere in the (subjective) middle is an email that reads like you know i am a non-litigious human but not your best buddy.