You can find the Selector in the domain DNS.
Look for the DKIM records and notice the value containing ‘._domainkey’ in the Host name field.
The Selector will be the first part before ._domainkey.
For example, if the name is default._domainkey, the Selector will be default.
![](https://glockapps.com/help/wp-content/uploads/2021/01/dkim-selector-1-1024x518.png)
Learn More: What is DKIM