The longer I work in my department, the more I grow to appreciate clients that actually know what they are doing. Or clients who have been communicating with us for so long that the emails got a little less strict and formal.

Having a client write something like "I know this mail looks scary long, but trust me, its just a few domain edits, nothing horrible" (freely-translated from my native language) just kinda... Sets me at ease and makes me chuckle.