Do I need MX records for my domain?
Technically, a domain does not require MX records to receive email. By default, a sending mail server should attempt to deliver mail to the host itself if no MX record is present. For example, if a sending server is trying to deliver mail to user@example.com, and example.com has no MX records, it will try connecting to any mail server at example.com itself.
However, it is highly recommended to create MX records for your domain, even if they seem redundant or unnecessary; in the above example, example.com should still have at least one MX record set to domain.com itself to help ensure delivery, like so:
Some non-RFC-compliant servers will fail to deliver email for domains that lack MX records
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