We have a testing server with its own domain name. We don't want any email to be sent from this domain. We don't want any email to be received on this domain.
Is it ok to remove the MX record from the DNS?
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mx is only needed if there is no a or aaaa records, and it must be a hostname mx
not define mx is not to decleare there is no email on that domain
sadly some antispam solotions thinks that missing mx is same as no mail on that domain name, fail
so to be clear, mx is not needed, as it was questioned here