In order for threading to work in API V3 please follow the following different rules across providers, in all cases use the previous message ID in the reply_to_message_id attribute.
We are working on a solution to allow for more customization.
The subject naming convention must follow the following format:
Microsoft
The reply must have "RE" + {previous_message_subject)
Google:
The subject must be the same
IMAP
The subject must be the same
Updated
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