If you are looking for the TXT record for your server, you can use the commanline tool in Linux, nslookup with the argument mx
Command:
Code:
nslookup -type=txt DOMAIN-NAME

Here is a detailed example, here we are looking for mx records of Gmail
Code:
dev@ubuntu:~$ nslookup -type=txt gmail.com
Server:        127.0.0.53
Address:    127.0.0.53#53

Non-authoritative answer:
gmail.com    text = "v=spf1 redirect=_spf.google.com"
gmail.com    text = "globalsign-smime-dv=CDYX+XFHUw2wml6/Gb8+1234567abcdefgh="

Authoritative answers can be found from:

dev@ubuntu:~$

The command to remember is, -type=txt