I sometimes have a message-id, sometimes not

[35mph]

I'm having a little trouble understanding an issue with my Outlook email.

The problem first arose when I tried to send on Outlook email to someone and it wound up in their junk folder. They got a warning message saying "No message ID."

If I send myself an email and go to View > Options > Internet Headers, sure enough, there is not a Message-ID there.

HOWEVER, if I send an email from Outlook to a _Hotmail_ account (which I open in Outlook), it DOES have a Message-ID.

How come the Message-ID is dependent on which account I send an email _TO_? It seems to me that the Message-ID would be assigned by the sender, not the recipient.

In another test, I can send a friend an email out of Outlook and they won't get it... if I send it from the web-based mail tool used by my SMTP provider (if that's the way to phrase that), then they WILL get it.

My Outlook uses that same SMTP provider as the web tool.

I don't understand how I can get a Message-ID to be attached with my Outlook emails. Is that the same thing as a Digital Signature?

Thanks!

 

[35mph]

I've just learned that Outlook 2003 does not include message-ids... If you have Exchange Server, you get 'em, but not with just Outlook 2003.

Anybody got a fix for THAT?