Could it be the 256Mb buffer size limit? Even with an 88 Mb RMAIL
file, maybe something like multi-byte encoding or the decompression of
an attachment could push it over the limit. Maybe (point) in
(rmail-decode-region start (point) mime-charset)
What would happen, in such a case, is an error from whichever
primitive tries to make the buffer too big. If some bug failed to
detect that, (point) would return a small number; it has no code to
detect overflow.
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