If you are thinking about starting a newsletter or already have one, here are some things to consider.
Go with a professional newsletter service. Yes, there are many newsletter options out there from software to mailing list programs provided by hosting accounts.
The bottom line is - you have an important message and want it to reach the intended recipient.
If your newsletters are not sent carefully they could wind up in a spam filter. Why? Because emails containing graphics are easily seen as spam - IF they are not formatted properly.
What is proper formatting? That's a good question. Most people don't know and so their emails wind up getting filtered out. What's worse is that email formatting standards change quite often.
Adding graphics into an email using Outlook may sound quick and easy, but it's not a very good idea (certainly not professional). It's not a good idea to use Outlook for mailing lists, let alone using it to add graphics to emails.
I would strongly suggest a company like "Constant Contact" (http://www.constantcontact.com/) where you can pick from many email templates that are tested and "spam filter friendly". Not only will their templates give your newsletter a more professional look but you can also get some useful reports about who opens your emails, if they are forwarded to friends, etc.
Stick with the pros and, in return, you should see better results and look more professional at the same time.