Getting something through the post still excites people. The printed word is still perceived as more credible to many people than anything on the web. It goes to the old adage, If someone invested enough to print and mail it, it must be important. It's amazing how different the perception is of the print versus online channel when it comes to editorial contribution.
There is the cost involved.. But anyone on your database who you know is a landlord (be they lost properties/ from a tenant reference or data mining from the land reg) should in my humble receive your monthly newsletter through the post every month.... 79p a month to get a landlord isn't a lot of money