I've got problem with some undelivered emails. Got many queues in my on-prem, which are tracking all of incoming emails. But some ot them are undelivered (purple icon). I realised that many of them (unfortunately not all, but I want to solve this case by now) are answers to previous emails, which has no answer from CRM. I mean client send an email, it is tracked, but he forgot to add some information, so after few minutes he answer/replies to his first email. The second one is undelivered and that's the problem. Tracking by token is on (some of mailboxes must track only answers to emails send from dynamics). I turn on smart matching, it worked for few tests, but then I got info, that other emails ain't matching again :c
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