I'm stunned... after a little bit of research, I've learned that Outlook 2003 doesn't insert a Message-ID with an outgoing email. If you use Exchange Server, then it DOES apply a message-id, but Outlook, on its own, does not.
Some recipients' spam filters check for the existence of a message-id, and if one is not present, then it's rejected or relegated to a junk folder... and the sender is not notifed of a failed delivery.
How can I continue to use Outlook if I can't be even reasonably sure that my emails are being delivered?
Is there a fix for this? Should I simply go to Mozilla or some other email client?
Some recipients' spam filters check for the existence of a message-id, and if one is not present, then it's rejected or relegated to a junk folder... and the sender is not notifed of a failed delivery.
How can I continue to use Outlook if I can't be even reasonably sure that my emails are being delivered?
Is there a fix for this? Should I simply go to Mozilla or some other email client?