o2.ptr1155.sage.com has no MX records.
Question and response
Question
dig o2.ptr1155.sage.com. MX
Answer
The response has no answer records.
Authority
sage.com. 1800 SOA rita.ns.cloudflare.com. dns.cloudflare.com. 2397239243 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0