Always put a subject in the subject line.
A professional email should be complete.
Formal emails also need to have correct grammar, spelling, and punctuation
when you are careful about how you write, you can leave a good first impression on others.
There should always be a greeting in formal e-mails.
Missing commas or periods might demonstrate to others that you are not careful.
Avoid using slang or abbreviations like LOL or BTW.
Being professional when you write emails means following certain standards.