nslookup -type=TXT _dmarc.yourdomain.com
The term "txt verified" refers to DNS TXT record verification. This is a technical process used to prove that you own a domain or an email address. gmailcom hotmailcom yahoocom txt verified
If you are sending from yourbusiness@gmail.com or yahoo.com address directly (not your own domain), you cannot get "txt verified" – because you don’t control the DNS. You must use a custom domain. nslookup -type=TXT _dmarc