Questione giuridica chiave
Whether the appeal filed by fax was admissible and properly substantiated.
Decisione estratta
The appeal was inadmissible because federal appeals must be filed in the legally prescribed form; a fax filing is not sufficient and no signed postal filing followed. It would also have failed for lack of an appeal-specific reasoning.
Motivazione estratta
Art. 48 Abs. 1 BGG and Art. 42 Abs. 4 BGG require filing by hand delivery/post or electronically with recognized electronic signature. The appellant did not cure the defect after the presidency letter, so non-entry was required under Art. 108 Abs. 1 lit. a BGG.