This a follow on from the previous post regarding the email services I have been reviewing.
A few faults of mail chimp that I have found is that sometimes it can feel abit too user friendly.
It’s not really a problem, infact it’s a sign the editor might be a bit too good in the sense that the editor now doesn’t allow enough flexibility in the way it deals with HTML code.
The other issue is that it can take a long while and a lot of time getting an email template that looks just right.
Sometimes one just considers a professional to make one and sort out your Direct Mail Marketing.
This way you are going to save a lot of time and most likely a lot of grief as well.
If your budget allows it, I would probably just go this route in the future. As simple as using a service like mail chimp is, the money lost in spending time in making your own newsletter is probably greater than the cost of a professional creating the email for you. 
That said, if you are a beginner at HTML and would like to learn more about creating emails, then doing it yourself would be good practise.