Email vs. Letter

What are your experiences? In my opinion a classical letter still has a special experience for the recipient: He can feel the paper it is printed on, can see various typos, etc. Because of all the different email-and text-encoding systems you have to use a very simple textstyle in your emails. At the moment I have to do a lot of acquisition for my company, and I´m sending many emails to the different companies. I wonder if I would send a well designed letter to them, I would be more efficient. What do you think…