Electronic mail vs. postal mail

Which of these services of mail are more reliable than the other as well as getting to your destination faster? I believe that electronic mail is a more reliable choice today. Why? Electronic mail doesn't only make it to your destination within seconds, but it also is more reliable in getting to your contact in time. In terms of marketing it's a lot faster to get one-hundred e-mails out referring to a product through e-mail compared to the long wait of regular postal mail. The benefits of e-mail have so much more to offer than postal mail. Today, I believe that postal mail is really only used for shipping nothing less than a package. Pictures, fliers, as well as just a regular letter are easier ways to get in touch with potential consumers. You also get more of a feed back of who is interested in products due to e-mail lists and polls that can go directly through e-mail. Over all I feel that any kind of promotion mail should be sent through e-mail over and kind of mail. What kind of mail service do you believe is faster/better?