Question marks (??????) are included in my messages - why?

[Frog]

I have been informed that my messages sometimes include a series of 
??????.  I'm not sure why this happening and if in fact is is me or 
something going on with the recipient computer.  It has been suggested 
to me that it has to do with two different operating systems being 
involved in the process (Microsoft and Apple).  Any thoughts how this is 
happening and how I can stop the ?????? would be appreciated.

Frog
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