To send letters direct to vendors, we have integrated with a partner called Stannp.
If you take a look at the setup page, you will see how to set this up. We have a template pack of letters designed precisely for integration with stannp which you can purchase to get set up straight away. Alternatively, create your own.
With stannp you can create any type of letter template or even postcard you wish.
Create a variety of templated letters ready for all the connotations of your sourcing strategy. Such as empty properties, properties with planning permission, R2R landlords, HMO sourcing.
Follow the link above and you will see the prices of each letter printed, packaged and delivered. This is cheaper than the cost of a single UK stamp alone!