I got it to work,
Turns out that angle brackets must be added in the Content-ID header for this to work in Gmail.
do part.Headers.SetAt("<id1>","Content-ID")
It's mentioned in this article , remark by masoudmanson.
https://stackoverflow.com/questions/41946783/gmail-blocking-small-embed…
Thanks for helping me solve this problem! I appreciate it very much.
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