I agree with xshadow:Just one email marked as spam could ruin the infancy of small company and a customer will just mark an email as spam instead of clicking un-subscribe.
But if you know your customers, you do not need to worry about SPAM issue as you use good PC software as you know these clients will not hurt you. SPAM is not only IP. Server is more and more sophisticated (50 filters) which can be increased security and IP,server are not alone. You have people and they decide what will be sold. Why Amazon developed [a9.com
...] if they have clients using Google?
Issue is CRM and search queries with customers intention not spam in the main point. As I understand IBM will launch application for this case. Some experts say Google and IBM will be in the line in the future. It is interesting why search engine companies do not worry with redirections inside newsletters but worry with search and intentions of people. You have business risk when you send newsletter and if there would be sales than Google and other search engines would create link inside Analytics.
My opinion is the following for year 2011:
If you use all the time web mail applications, than you lose flexibility of CRM where is important mobile CRM. It is true that people use more and more plain text e-mail messages as content and reading is more important than general links which people already have. I agree with this.
Some of the top blogs use newsletter (email message) like:
1. Reply: mypersonalblog@yahoo (gmail).com
2. Plain text message
3. Minimum options like Subscribe, Unsubscribe,
3.1 Click here to safely unsubscribe
3.2 Click here to view mailing archives or here to subscribe
You will have subscribers that are not angry as reply is YAHOO, GMAIL and sent by valid service inside header like:
I have never used feedblitz.com but maybe some of them will give feedback.