Can I install your fence letterboxes horizontally? Sales Support August 07, 2019 00:59 Updated In most cases you can. But it would be best to contact us to check, just to be sure. Related articles Do you install letterboxes? How much does shipping cost? I ordered a timber panel letterbox, where are the anchor posts? Do you have any rain resistant letterboxes? I've received my product but I can't find my keys Comments 0 comments Article is closed for comments.