Questione giuridica chiave
Whether the registered warning letter of 18 August 2009 was proven to contain the rent default notice under Art. 257d CO
Decisione estratta
Once dispatch of the registered letter was proven, it was presumed to have contained the relevant notice; the tenant failed to rebut that presumption.
Motivazione estratta
A concrete challenge requires arguments creating doubt about the letter's content. Mere lack of recollection or speculation about an empty envelope is insufficient.