>>sieve: info: started log at Sep 14 16:13:49.
>>main_script: line 62: error: unknown command 'elseif' (only reported once at
                                               ^^^^^^^^
>>first occurrence).

Ok, so elseif is not known, switching to "elsif" and everything works as
expected

>>main_script: line 65: error: the else command must follow an if or elseif
                                                                     ^^^^^^
Is this a typo, then?

>>command.
>>main_script: error: validation failed.