Very often, mailing without a specific recipient address is used to deliver an advertising message to potential customers. One of the advantages is to target potential customers to a particular area of the city or street or even a particular house.
For example, you have opened a dry cleaning service and next to your office 5 multi-storey buildings, you can make a personalized offer for the residents of these houses, through a non-address mailing to the mailboxes of these 5 houses.
It is very important that the advertising message was profitable for the client, had a limiter and called for concrete actions. Most advertising messages do not have such a device, so they are often ineffective.
You can increase the efficiency using a regular white envelope, so that your advertising message does not look like another ad, but stood out among others. In the envelope you can put a letter to potential customers and a special offer. Well decorated with the soul and passion of the writing will resonate with potential customers.
Once I saw letters in an envelope made of cardboard, well decorated and sealed with wax seal. After this approach, I wanted to read the content and I certainly appreciated this professional approach.