Which of the following is an essential guideline for professional email usage?

Proper grammar and spelling are vital elements of professional email usage as they contribute to clear communication and convey a sense of professionalism. Emails often serve as formal records of communication in a workplace setting, and maintaining a standard of accuracy reflects attention to detail and respect for the recipient. Errors in grammar or spelling can lead to misunderstandings, diminished credibility, and a lack of clarity in the message being conveyed. By using proper language conventions, a sender demonstrates their commitment to effective communication and professionalism, fostering better relationships and ensuring their intent is understood as intended.