Answer:
Service record (SRV)
Step-by-step explanation:
Service records (SRV record) are data records stipulating specifications of the DNS such as the port numbers, servers, hostname, priority and weight, and IP addresses of defined or cataloged services servers.
The SRV record is the source of information and the search site about the
location of particular services as such an application i need of such services will look for a related SRV record
A configured SRV is the source of the ports and personal settings for a new email client, without which the parameters set in the email client will be incorrect.