FOLLOW-UP:
Well, I think I found the solution. Yippi!
It turns out that it only affected Microsoft Outlook IMO Build 9.xxx, and not all of them...
A smaller group who I didn't study had every line double
spaced.
I solved it by striping the return from the CR/LF pair in
the message body before calling ns_sendmail:
regsub -all "
" $body "" body
I don't know why this works... This problem was never reported
when we were using sendmail but started showing up when we
started using postfix. I tested from the command line
by telnetting to the port with HELO etc and found NO problem.
So then it occurred to me that the telnet window was only
sending new lines... LF's.
Anyway, onto other stuff...