Odoo Incoming Email Bounce - This Address is used to collect reply

My scenario is that the user sent out email from Odoo to the customer (eg, Quotation), so when the customer replied the email, this replied email should be appended to the email thread in the document.

But, instead, i've received "This address is used to collect reply and should not be used to directly ....", the following is one of the quick fix.

Go to mail module -> mail_thread.py -> message_route method.

We have to make sure that the is_a_reply is True

Odoo incoming email setting with Gmail POP Server.

Actions to Perform on Incoming Mail - leave it empty or "Email Threads".

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