imap.similarbridges.com has no NS records.
NS records for this zone are defined at similarbridges.com.
NS records for this zone are defined at similarbridges.com.
Question and response
Question
dig imap.similarbridges.com. NS
Answer
The response has no answer records.
Authority
similarbridges.com. 3601 SOA dns1.registrar-servers.com. hostmaster.registrar-servers.com. 1761616825 43200 3600 604800 3601
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0