I'm sending e-mail from my application using CDO and I've managed to set the
following fields with values:

..Fields("urn:schemas:mailheader:x-message-flag") = "Follow Up"
..Fields("urn:schemas:httpmail:reply-by") = dtDate

The received email appears to be getting these valued properly (they appear
in the Outlook header) but the message doesn't pop up a reminder when the
date/time comes. What am I missing? I'm making sure my date variable dtDate
is a future date, although that doesn't matter when I create an Outlook note
interactively.

I'm also not seeing the flag status icon, and I'm not sure if this is the
reason why, but I can't find the field name and value to set.

Any suggestions? How to get the reminder to appear and/or set the Flag
Status icon if it's relevant/related?