Yep, go for Ilew's advice, please.

Even I would guess the decoding stops before all header fields read (provider moved it to a later position, possibly inserted a not-known header field in front of the 'From'?) as 'From' is a mandatory field and as you saw it is inside the push.
Did you check the binary '.sav' file (if existing) or the header file in the message folder, too?

Oh and thanks for the full logs ! [but at least you should/may remove clear text phone numbers for privacy]