Letterbox security guard?

thor

I am looking for something which blocks things getting shoved through letterboxes overnight. Luckily it has not happened to me but my neighbour has had problems and I am sure you can get something which can be locked into place behind the letterbox and then removed during the day. Any ideas?

greyteam1959

http://www.safetyletterbox.com/domestic/letterbox-security/index.php
You could actually make something up like this yourself if you can d a bit of basic DIY

Stooby2

or how about something as simple as this?

http://www.lockfinder.co.uk/sash-jamming-device-56-p.asp

Under the bottom of the letterbox, in the middle to stop the flap from being opened.