Hi,
Thanks for contacting our forum.
Given the error message, it seems that our domain DNS records cannot be lookup correctly. You can use NSlookup to check. Meanwhile, you can use telnet command to test too.
We can also use the MXToolbox:
https://mxtoolbox.com/ to test our domain, if we have a DNS records configured correctly.
If any test results, please post out. Or you can post out your domain name, i can help to test.
Hope it helps.
Regards,
Jason Chao
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