So you’ll need to modify import_mbox.sh to truncate the email and strip out the Sammsung nonsense.
It could be an issue that could be resolved in core, as those messages probably fail when processed by emailing them in (but I haven’t looked at the code lately, so I don’t know). In any case, the most expedient solution will likely be to modify the import script for those messages.
Or maybe someone will recognize this as a problem in core and fix it.