So in German when you write a letter, you start the body with a minuscule letter because the salutation is seen as an interjection, I presume:
We just saw [yada, yada, letter]
Dear Max, we just saw [yada, yada, letter]
So, my question is: is it OK to start a letter in English with a lowercase letter, or is that bad style/mechanics/etc? If it's not acceptable, what is the salutation considered as and why do we separate it with a comma if it's not part of the first sentence.