mx01.office.is has no MX records.
Question and response
Question
dig mx01.office.is. MX
Answer
The response has no answer records.
Authority
office.is. 86400 SOA ns01.office.is. cpanel.premis.is. 2026010300 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0