is saying "hello guys" in an email inappropriate? I work for an IT consulting firm and I work at a client site for a long term project. I addressed an email to people in my team which is made up of other consultants from my company and employees of our client. I addressed it with "hello guys". Is this inappropriate? I thought this is quite normal. But another consultant from my company sent me an email asking not to do it again as he thinks it is inappropriate. I am not sure if I can survive being criticized for such simple, subjective things.