opsmail.colo.comodo.com has no TXT records.
Question and response
Question
dig opsmail.colo.comodo.com. TXT
Answer
The response has no answer records.
Authority
comodo.com. 2560 SOA ns1.nurd.com. dnsadmin.nurd.com. 172800 60 60 60 60
Additional
The response has no additional records.