To make matters worse, as your advice pertains to this thread, putting
email
addresses in the bcc field often sets off spam detection rules.

Precisely.

That's what I was assuming was triggering the bounce-back, until they
bounced back AGAIN when I sent the messages individually.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"