Sorry, we have no DNS information about mail.yum.sg. yum.sg is a domain controlled by two name servers at stabletransit.com. Both are on different IP networks. Incoming mail for yum.sg is handled by
yum.sg is a domain controlled by two name servers at stabletransit.com. Both are on different IP networks. The name server dns.stabletransit.com stated in SOA record is not in the list of name