whatsmydns.net - DNS Propagation Checker
ALL A AAAA CAA CNAME MX NS PTR SOA SRV TXT ANY

No ANY records found for mx.pao1.isc.org.

Try pao1.isc.org instead?

id 11794, opcode QUERY, rcode NOTIMP, flags QR RD RA
;QUESTION
mx.pao1.isc.org. IN ANY
;ANSWER
;AUTHORITY
;ADDITIONAL

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