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Assuming a vanilla POP3 account in Outlook, how does one get the Message-ID: header of sent email?

Alternatively, the raw MIME object as submitted to the SMTP server would be equally valuable. E. g. a way of making Outlook dump every message it sends into a text file.

This concerns Outlook 2013+. The problem is some ERP system sending email via MAPI which appears to generate defective MIME structures. Customer claims “it did work before!”

(There are numerous how-tos online that point to the menu „File → Properties → Internet Headers“ but the version of Outlook I have access to, it shows no headers there at all.)

phg
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1 Answers1

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As far as I know, there should be message internet headers no matter which version you have(Outlook 2010-365). Please make sure you open the message in a new window first, then click File > Properties, here you can see the internet headers.

Aidan
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