Postfix Host Or Domain Name Not Found Type A

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Postfix Host Or Domain Name Not Found Type A. Host not found Above is what I get when I send email to New Postfix Server. Boosting a couple questions mentioned in comments that might help figure out whats going on.

Set Up A Mail Server With Postfix Dovecot Roundcube On Ubuntu 18 04
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Your domain doesnt have an MX record to specify where mail should be delivered. Every host I check knows where the exchange server is but we still get this error. Name service error for namemydomaincouk typeA.

Alias_database hashetcaliases alias_maps hashetcaliases command_directory usrsbin config_directory etcpostfix daemon_directory usrlibexecpostfix debug_peer_level 2 html_directory no inet_interfaces all mail_owner postfix mailq_path usrbinmailqpostfix manpage_directory usrshareman mydestination myhostname localhostmydomain localhost mydomain mynetworks_style.

Can you add your etcresolvconf to the question. Have you successfully sent mail to other systems from this. Symptom in the log. Sudo service postfix restart.