Is “Thanks and regards” your preferred poison when a simple “thanks” will do?
Or is it a “Yours Sincerely” when you could just write, “Best”, like Phil Gomes here does…
Alternatively, you could be like a certain ex-boss of mine who used to sign off EVERY email to everyone and anyone with the standard formatting of “I am awaiting your reply”. I once pointed out it could come across as a bit forward or rude depending on the context of the communications, but he responded with a curt, dismissive “It gets results – I hate emails anyway”.
Phone numbers or no phone numbers? Contact details for easy cross access?