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Our letterbox is home to our garden snails, and they have a real appetite for postal letters. Every few days, we collect them and clean out the area. Trying not to use snail bait, I read that copper tape might repel snails, and there are some videos on Youtube. It will be raining here for several days so hopefully, this will keep them out.
Thank you for this post! We've recently moved to the new area and our snails are just crazy! They can eat a whole letter in 2 days! We tried coffee and this copper tape, however, I didn't help us unfortunately 
The copper tape should be effective, @Nham. If they still cross it, perhaps add another strip to double the width.
Snails aren't fond of a few different surfaces. Sand is one of them, so perhaps you could add a thin layer at the bottom of the letterbox. They might keep to the walls, though.
You'd need to do some work to the opening on your current letterbox, but it could be possible to retrofit a flapped plate onto it. However, that could take some finessing with an angle grinder.
Shout out if they make it past your copper barrier, and we can try to come up with more options.
Mitchell
It has been a week, and we don't have any snails in the letterbox yet. By now, and with all the rain, we usually get a whole family of snails living here.
