Hi @desai.neel,
Welcome to community.
In version 1.12.2, HeaderCollection gives you the following outputs, in the new version only “Uid”, “Message-ID” are given.
HeaderCollection(9) { "Uid", "Message-ID", "Date", "DateCreated", "DateRecieved", "DateReceived", "HtmlBody", "PlainText", "Size" }
I think this situation was noticed, these fields are added again in version 1.16.0-preview.
My suggestion is to stick with the old version until 1.16 is released.
Regards,
MY