Anyone have a wallmounted mailbox that can handle A4 letters?

[puntloos]

This seems like such an obvious thing, A4 letters are 21x29.7cm but most mailboxes might hold them but the slots are smaller, eg:

 

 

Why can I not find mailboxes with a 21cm slot? Or is this actually not a problem in reality?

 

bonus: I would love a mailbox with an anti-theft lip, that prevents people bending their fingers into the box and grabbing mail.

[Nick Thomas]

I put up one of these last year: https://www.screwfix.com/p/smith-locke-compact-post-box-black-powder-coated/8161p

 

It's not amazing, and it doesn't have the anti-theft lip, but it does fit A4 letters in - 26cm total width, and definitely tall enough.

[MPH243]

I have one of these, 

https://www.amazon.co.uk/gp/product/B08L81K2P4/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

they fit sideways but with a news paper slot below.

 

It's quite good and stays dry in heavy rain. The first one got wet with light rain.

[puntloos]

Maybe I shouldn't worry too much about the smaller slot size.. people tend to fold a4, maybe not a huge deal (plus how many a4 letters do I get per year..)