F9: Outgoing mail using "mail" doesn't work

[Eric]

It appears that outgoing mail using the simple "mail" command (as in 
"mail abc at def.com") isn't working in F9.

I don't recall doing anything special in previous releases e.g. F8, 
F6... it Just Worked.  I think.  I have some notes from those 
previous installations and don't see anything in there that I did special.

I have gone through the archives for this list as best I can and 
haven't found anything that's on-point.

Obviously I'm doing some basic boneheaded thing here but...