Writing and receiving emails has 
   become an inevitable part of 
   everyday life, both in private and 
   business correspondence. When 
   writing an email to your family or 
   friends, you may be as casual as you 
   want. 
  But wait, are you sure you can write a 
   proper business letter to your boss 
   or a client? There are some business 
   email etiquette rules and that 
   everyone is required to follow, even 
   if you are a non-native English 
   speaker.
   1. Subject Line Says a Lot
   No doubt, a subject line is the first thing a 
    recipient reads. The decision of whether or 
    not to open an email depends highly on 
    how the subject line looks. Make sure the 
    subject line is simple, specific, but catchy. 
    Use key words that briefly summarize the 
    content of your message.
    “FYI” in the subject line is a commonly used 
    abbreviation of “for your information“.
   2. Start Your Email with Greetings
   There are many variations of greetings 
    that you can start your email with, but 
    the most standard ones are:
    Dear Firstname Lastname
    Dear Mr./Ms. Lastname
    Dear Mr./Ms. Firstname Lastname
    Dear Dr. Lastname
    To whom it may concern
  It is always important to have a 
   contact name, unless a recipient is 
   unknown ( in “to whom it may 
   concern” case). If needed, don’t be 
   shy to call and ask for the person’s 
   name. Some people use informal 
   salutations, such as “Good morning” 
   or “Hi“. It totally depends on how 
   formal your relationships are.