I know it's nitpicking, but why do cemeteries have a mail level of 36? Are British stiffs that communicative, or do people... send their deceased... you know. But that would be one-way traffic only, wouldn't it?
The simple answer is that it is not possible at present to set a separate mail and passenger level for attractions. You can imagine that the cemetery keeper is very popular if you like...
This may well be changed in the new passenger generation code, but I cannot remember now.
Dead mail has to go somewhere... sorry, IT humour. :)