You’re more apt to get a piece of direct mail in front of your customer than an email. Time and time again, direct mail holds its own as a cost-effective component of a complete cross-channel marketing strategy. The flexibility of direct mail is unparalleled. You can use direct mail to drive customers to a website, offer a coupon or deliver a sales message. Used repeatedly, it can establish and maintain customer loyalty and enhance brand awareness. Managed well, the results of your direct mail campaign can easily be tracked and measured which is reassuring for every company trying to maximize and control spend. See the entire article:

https://www.lifehack.org/articles/work/the-importance-of-direct-mail-to-your-companys-marketing.html