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It's actually described here:
"Issue 1" is what I have.
Please see attached screenshot. Link Translation rule as suggested in the article doesn't work.
That is what I thought. As JW3 said in the referenced post, that is expected. You can try to train users to open the actual message instead of clicking the link or try and get link translation working.
Thank you for the link. One question, how the system knows to replace the internal fqdn with the external one? I don't see any option of replacing the name in the article.
I just ran the process on the test user, the link still points to the internal FQDN.