I am attempting to set-up a subdomain on the domain droplet with the NGINX server on Ubuntu 20.04 to implement a DMARC record for my outgoing Gmail through a WordPress SMTP plugin with preconfigured SPF & DKIM records. I did some research and found the following tutorial but unable to complete Step1 creating an “A” record with an error message “Name is not allowed to have an underscore in it”. Can someone please assist me by providing a link to a step by step instructions on accomplishing this task.
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