Thanks for Help
The mail receipt is normal, but the email sent to me by 163.com is not accept.
163.com is one of the largest email service providers in China.
Yes, I have a rule allowing the 163.com, But it is not working, I deleted it.
I have mail server Microsoft Exchange , I checked the rules and even reset the firewall. The fault remains.
It is strange that the firewall has no record.
How can I fix this problem? who can help me to test, I can use 163 email send.
Another post: community.sophos.com/.../some-of-the-emails-cannot-be-collected-invalid-tcp-rst
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