Hi
I would suggest to you use a software to send out emails. As your using outlook that will not provide you much features than any software can provide you. The issue with HTML now but after sometime you will have trouble with any other feature. For this all problem there is only one solution to it. Join a company that provides you clean SMTPs, IPs and domain. The company which ensure you that your email will be sent to the inbox not to spam folder. I have tried with many companies and never got better results then www.imailunlimited.com they are the best in the email marketing. They have guided me in each and every part of there software. I never had any problems with them. They provide 24x7 customer support so anytime any place you can contact them and have your assistance. I would like to highlight some of there feature, hope you will try them once. Thanks you.
-Mail from rotation
-Mail From Name Rotation
-IP rotation
-Domain rotation
-Email List splitting
-Live Reports ( Opens + Clicks + Deliveries + Bounces + Blocks)
-They also offer List Cleaning (in case you have a bad list)
-There software is 100x faster than Interspire
- I believe the best support and they are 24/7 online.
-Exporting of the Reports
-Importing contact list is really fast
-Test Send + Spam test Feature is really nice
-Creating Campaign and cloning looks excellent.