Server side sync skip tracking of send emails in email thread, if email are exchange between external contact and internal D365 user within in 20-30 seconds.
Repro steps
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1. D365 user, using server side sync for Incoming, Outgoing and appointment contact and task. Personal tracking option set as 'email in response to 365 email'
2. from Outlook --> where we have COM addin as well -->D365 user send an email to a contact---> in compose mode itself we did 'set regarding' --> it was tracked with in 2-3 minutes successfully.First email is part of D365 now.
3. Contact reply to email in 1-3 minutes--> replied email is tracked for D365 user.
4. now D65 user again reply to this email in 1-2 minutes ---> sent email is also tracked with in 5 minutes.
5. now contact reply to this email in 20 seconds and again D365 user reply with in 15-20 seconds--> we observed --> sent items are not tracked anymore.
6. we also did 'test and enable mailbox' with small checkbox checked waited as per postponemailboxprocessinguntil and waited for more than 2-3 hours + as well. Still send items which are a part of same email thread and that are sent in 15-20 seconds time gap is not auto tracked by Server side sync.