CID embedded images in email template

In our project, we're working on incorporating images (company header and signature) into our email templates for sending purposes. We have recognized several potential methods to achieve this:   1. HTML inline embedding (utilizing Base64 encoding) – Outlook tends to block this approach. 2. Linked Images – This method requires recipients to download images externally. 3. CID embedded images – We are considering this method as an alternative.   As you can observe, there are challenges with the first two methods. Has anyone had experience with the third approach, which involves using Content IDs (CIDs) to embed images? Alternatively, if anyone has employed different techniques to insert images into the HTML body of an email for sending, your insights would be greatly appreciated.
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