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Am I able top get to the email headers of a message without downloading the full email message, I want to check for a certain OEM string in the message header , if I find it, I don’t need to download the email.

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Yes you can, pleased use Imap.GetHeadersByUID() method.

Some servers allow you to search for particular header value:

List<long> uids = imap.Search(
    Expression.Header("X-Key", "substring-to-find" ));
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