If the memorandum is anything like they used to be in FAR and AUD, then the last sentence must contain something like, “Do not hesitate to contact me should any additional inquiries arise…” I would definitely insert a “sincerely” or “best regards” before typing your name. I will also refrain from using contractions such as, “don't” or “can't.” It is more professional to use “do not” and “cannot,” for example.
One thing that helped me in FAR and AUD (when they contained communications) is the cursory information at the front of the becker book. I studied that right before the exam and scored well on my communications in both of the exams. Luckily, I still have those books so I will be studying those tips in preparation for my BEC exam.
Texas CPA - licensed in 2012!!!