Help me how to solve this problem, even though before I used ipv6 on cloudfare the email worked fine, please help if anyone understands
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To send email from a third-party domain email using Gmail it is preferable and common to use an external mail server. The error message you see is notifying you that the hostname of the mailserver that you configured is no longer resolving in DNS. You should start by checking your DNS records to see if the mailserver hostname was deleted.
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