TIL: MX records on the domain will be inherited to subdomains! Not necessary to create it on every single subdomain. Same for DKIM, depending on the mail server setup. (Which record is mentioned in the mail header)

TIL 2: You're not even need a MX record if the mail server operates on the IP of the main A record of the domain.

// edit: fixed mistakes - SPF/DMARC must be set on subdomains

#dns #email