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I was creating a daily digest newsletter for a intranet, in this newsletter we also add avatars of users, these avatars are added with CID's.
I noticed that Mailhog does not support reusing re-using of CID's, it only replaces the first instance. This is because of a bug in the javascript, it uses the JS String.replace() method which only replaces the first instance by default. I replaced it by a version that uses String.split() and String.join().
I also removed the TODO as it seems to be implemented already.