Yes or no? Am I allowed to do this? Can I use a colon after 'Mike'? Is it totally wrong to do so?<br/><br/>Hi, Mike:<br/><br/>I am writing to say that I found the meeting to be informative. ....<br/><br/>-------------------------------------------------------------------------------------------------------------------<br/><br/>I heard that two commas (one after 'Hi' and one after 'Mike') is technically very correct. Agreed?<br/><br/>Hi, Mike,<br/><br/>I am writing to say that I found the meeting to be informative. ....<br/><br/>Thanks.