Start by creating your mailing calendar, try and organize the arrival of your mail. Avoid sending out direct mailing during the holidays for example, when people are not likely to be at home and never send two mailings at the same time. If you do need to send two different messages, make sure they arrive on different dates.
When you choose your type of mailing message, prefer postcards to letters. Apart from the slight difference in postage cost, which adds up quite a bit when your mailing hundreds or thousands of messages, postcards are more eye catching than letters. Letters come in envelopes, they cost more in stamps and often people won't even bother ripping up the envelope to see what's inside. A postcard is definitely more direct and it's content can be appreciated at once.
With a brightly colored postcard and a brief and direct message you'll do wonders for you direct mailing campaign.
Try and establish a look people will recognize, such as a logo or tag line, this will help people immediately identify your brand or company. This is one of the key elements of direct mailing campaigns. Display your logo or tag lines frequently and try and use only a limited palette of fonts in your direct mailing messages, for too many different fonts and styles will make reading the message difficult.
Use a postage meter, this investment will permit you to save on excess postage costs. You will save time and the hassle of purchasing stamps, plus you will be printing the exact postage on each mail. This may seem to make a small difference, but it does add up over time.
Use other company documents to coordinate the feel and look of your mailing material. It is a mistake to manipulate your company identity to fit particular needs specific sales campaigns, this will only confuse potential customers on the long run.
Always keep in mind that if you want your direct mailing to be successful, you must send your message to the right person, who will read it and be persuaded to trust your product or service. This is what you should be aiming at.