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I have added the Domain pointing to the IP in the /etc/hosts because it was not resolving in the DNS server of my ISP. This is not the best solution because if the domain changes its IP address I will have problems again.
What can I do to resolve this please? Is there another better solution please?
It's been 24 hours since you last posted, saying you found a temporary solution. Your original question was answered.
You were put on the right track, even though the original error was easily found on Google. Since you know it's DNS related, have you tried to investigate how to get Sendmail working with DNS further upstream?