Summary: direct mail is always among the ways for company propaganda and product promotion. However, the postage of those direct mails may cost a lot for your company. Here is the solution.

For company development and communication end, you and your employees have to do communication with others, by mail or other ways.
1. Clear you mail list
The U.S. Postal System will clear you mail list for free. And if you want to enjoy a discount favor, change your address and give notes to those incomplete addresses and add ZIP+4 numbers. The discount may save you little for one mail. However, many little makes a miracle.
2. Clear your mail list again
Do you mail to a same group of people every time? One thing you should realize is that among all those people, some pay no attention to your product and service and even feel annoyed at your mail. After you sent your first two mails to the target group, make a statistic that how many people give feedbacks to you, thus you can remove the rest ones from your mail list.
3. Be an early bird
If you want to send you mails to your potential customers as quick as possible, you should have your mails be send in morning. What's more, usually the morning mails can enjoy a lower price.
4. Find a night-worked mail carrier
Look around and find a night-worked mail carrier. The efficiency of night mails enables your company a more competitive company. You have to wait for such a man for few hours in night. However, you mails will be received in an early time.
5. Email is a good idea
If you intend to pay little at mail, then choose email. Find people who are interested in products and service that are similar to what your company provides, add their email addresses to your email list, and send emails to them. Email is no doubt the most convenience way to promote your products.