A friend in the UK had his deposit withheld as "mail charges" by his landlord upon moving out. Turned out the fine print in his lease said that he wasn't allowed to receive mail at the house he was legally renting.
Pretty sure that is not a stipulation you can legally put in a tenancy contract. Because both parties have to be able to serve notice on the other via post in writing. Same reason you are legally entitled to know the postal address of the landlord.
Not a native speaker. How do you refer to the pieces of paper that the Royal Mail sometimes drop through your letterbox?
This is unlike the US Postal Service, which delivers "mail".
The comment claiming not to know what "mail" was clearly struck people as a little dismissive of US English (any native English speaker knows both "mail" and "post", regardless of which one is used locally)