There were, unfortunately, no responses to this post — a situation I find very often now in this forum.
For those who still participate here:
I solved this problem by trial and error.
WP 2.0.4
My email address as listed in the Dashboard > Users > Your profile was the same as the Dashboard > General Options. This listing is noted as “for administration purposes only.” It was created “automatically” on installation.
I still don’t know what that address means but conferring with my host about why I can’t get email from that address, we decided to just create another email address for me and that worked for sending and receiving email.
It is that address that I then changed the Dashboard > Users >Your profile entry to my new email account.
I submitted a comment and was immediately notified by email.
Can’t explain why, but this worked for me. I hope it will be helpful for others waiting for response to unresolved issues in this forum.