Hot!Help FortiMail: Lost Input Channel

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2019/11/20 02:40:31 (permalink)

Help FortiMail: Lost Input Channel

I am new with FortiMail.
I have a question, we've got the log in mail event that show the message : "lost input channel from [x.x.x.x] to SMTP_MTA after mail".
And when I check the same session ID, I've got the message : "from=<>, size=126100, class="0", nrcpts=0, bodytype=8BITMIME, proto=ESMTP, daemon=SMTP_MTA, [x.x.x.x]".
And after that problem, the email sent by sender failed to receipt 
Only 2 logs in one session ID, and I don't know source of the problem.
And the problem also occurs in several mail inbound from different domain.
I run fortimail in VM as a Gateway with Firmware version: v6.0,build148,190422 (6.0.5 GA).
Could you help me to pointing the source of problem?
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