The conventions for email at work are a little different than for email among friends.
Professional email can still be informal.
But a lot of the humor and wit that's appropriate in a discussion group is out of place at work. For the most part, signature files are not used in work email, unless the email is sent to external recipients. Q. My organization just installed an email system, and everyone is starting to use it. Preferably three or four times a day, but at least twice a day. You should always check your mail in the morning when you come in to the office and in mid-afternoon, or an hour or two before you leave.