How to sign off emails

Who gets the last word in an official email exchange? What’s the protocol for rounding off a series of online letters between you and a client/company?

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There’s a page from Oxford Dictionaries with tips on writing business emails including points on use of formal language, editing before sending, presentation of messages and referring back to how your company sends out its messages.

I also found this useful list from Grammarly.com/blog, citing (in order of preference):
FORMAL BUSINESS: Regards, Sincerely, Best wishes
FRIENDLY BUSINESS: Cheers, Best, As ever
GRATITUDE & REQUESTS: Thanks in advance, Thanks, I appreciate your…
AVOID: Love, Thx/Rgrds, Take care, Looking forward to hearing from you, Yours truly, Respectfully, [nothing], [name/initial], Have a blessed day, [Sent from my iPhone] 

I must admit I’m guilty of a few of the AVOID examples (apologies if this was you). In any case, next time me and my best mate (COUGHDebsCOUGH) close a message by throwing a whole menagerie of huggy GIFs at each other, we should probably remember that, at some point, all the animals need to get back to work.

Best wishes, Wordfairy