If you have a quote unequivocally stating anything like "Unless specifically stated otherwise, a spell's damage will always be magical." please do present it so I and others can stop opening this thread to no where. Preferably implying just how specific that language needs to be.
Right now we have 1 ruling and 1 rule both with caveats.
JC with directly - Some spells do/cause decidedly indirect damage others could be debated
Errata with attack - as pointed out earlier several would be affected spells aren't attacks
Errata with delivered - as just pointed out the meaning/scope of delivered is contentious