> This sounds like a great idea and one I'd  like to try.  But what happens
> in  the digest?    Does each  person's  address  appear along with  their
> message or is the DUAL ignored?
 
DIGEST  recipients *always* see the address  of each poster.  DUAL isn't so
much  ignored,  it's just not applicable  when  someone is getting DIGESTs.
It's two different ways to pack the messages before sending them.
 
Norm
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If you want to improve your understanding, drink coffee.