2 added 180 characters in body
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If I'm correct:MX record only sets the domain to use for emails. In your case you set it to mail.domain.org. To control what mail.domain.org resolves to, add separate A record or CNAME for mail.domain.org. E.g.

mail.domain.org. in A 123.45.67.89

If I'm correct:

mail.domain.org. in A 123.45.67.89

MX record only sets the domain to use for emails. In your case you set it to mail.domain.org. To control what mail.domain.org resolves to, add separate A record or CNAME for mail.domain.org. E.g.

mail.domain.org. in A 123.45.67.89
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source | link

If I'm correct:

mail.domain.org. in A 123.45.67.89