won’t be known by the computer and the mail won’t be sent. If you receive mail because you are in a particular mailing group you have not created, you can tell who else is in the group by looking down at the very bottom of the message (if the original message was composed with msg). So if you want…
Endicott, Don · Naval ocean systems center san diego ca · Handbooks · Electronic mail · Computer files · Keyboards · Computers · Communication and radio systems
Internet Archive · Defense Technical Information Center · Public domain (US government work). Free to use for anything.