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My Client is having issues with his email. My smartermail (server) is based at Singapore. When I perform a self test at my computer, everything is working fine.
However in China, my client is unable to send. I checked the smtp log and saw a 500 command unrecogized.
09:57:49 [188.8.131.52] cmd:
09:57:49 [184.108.40.206] rsp: 500 command unrecognized
How do I resolve this