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I've noticed the mail records such as below and somehow the mails I receive from the domain come from the one with the higher priority (bottom one). I think it should have been using the other one.
test.com. 37536 IN MX 10 test123.com test.com. 37536 IN MX 30 something.com
How is that possible? Do you think this is a redirection issue? It sends it the top one and it redirects all the mails to the bottom one? And for outbound emails, it probably does not even matter as it looks at the destination mx record. Am I correct?