Please do not put IP addresses into DNS MX records

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I want to highlight a common misconfiguration in the DNS records for e-mail servers. When a domain is configured to receive mails usually a DNS record of the type MX is configured pointing to the host name of the mail server. Notably, according to the respective RFC 1035 the MX record must contain a domain name and may not directly point to an IP address. However some mail servers do configure an…

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