Hebrew encoding question

[Mordecha Behar]

I just got another digest email from Hamakor, and once again it is full of
question marks.
This usually means that a different encoding is being used.
However, my browser (and hence email client) is using Unicode (UTF 8). When
I tried viewing in various encodings (Hebrew IBM 862, Hebrew Windows 1255,
Hebrew ISO 8859-8 and 8859-8-1)I still just got question marks.
So, what encoding is Hamakor using to send these emails? And why aren't they
using anything standard?
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