Finalizing the Letter. Edit and Review: Once you are finished with writing the letter, try to look for errors. Check for spellings, punctuations, grammatical errors. Don’t Staple the Letter: Use a paperclip on the top of the left corner if there are many pages. Use of staple doesn’t look nice for a business letter. Posting of the Letter: Always use clear and correct spelling for mentioning the name and address of the recipient.
How do you know for sure whether or not to use a closing? One good test is to ask yourself whether this email is more akin to an instant message/text or a business letter. If you're giving your teammate a quick update on an ongoing project, a formal closing might not be necessary; if you're throwing your hat in the ring for a promotion, it definitely is required. When all else fails, and you're still not sure, err on the side of caution and include it. You'll never go wrong by being too polite and respectful.