How do I install my letterbox? Sales Support A October 13, 2017 00:31 Updated Depending on the letterbox you have purchased, there are various methods of installation. Please click here to find your method of installation. Related articles Do you install letterboxes? Do you have any stockists or retailers? Can I paint over the letterbox? Do you have any rain resistant letterboxes? Do you sell commercial / bank letterboxes? Comments 0 comments Article is closed for comments.