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Why postfix reject outlook to send mail(always says relay denied)?

Dear Experts,
Now, I am trying to setup my company email system with postfix/dovecot .
Unfortunately, the system always complain as
"Relay denied" when I try to use outlook express to send mail to 1372921435@qq.com.
I have pasted the maillog and packet trace file here.
Can you help me to figure it out??

Note: For the packet trace, you just open it with wireshark(Change the extension from zip to pcap)

Email ServersLinux NetworkingNetworking

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8/22/2022 - Mon