If your domain is pointing to Hostinger, you can manage your DNS records via the DNS Zone Editor.
To add a new record, choose the type of record as MX:
NOTE:
If your domain is pointing elsewhere by NS records, your DNS Zone management is moved to the provider you pointed the domain to and should be managed from there
What Values to Use?
Name (Host)
If you are adding MX records for your domain, insert @ as Name.
If you are adding MX records for your subdomain, insert the subdomain’s name as a Name. For example, for the subdomain support.domain.tld you should use support as a host.
Mail server (Points to)
The value for Mail server indicates the server that will manage your domain's email. Your email provider should give you this information. For example, for Hostinger Email, they are the following:
mx1.hostinger.com
mx2.hostinger.com
Priority
Priority for MX records defines which mail service will be reached first when sending or receiving email. Each record will have a priority and typically will be in increasing numbers. For example, for Hostinger Email, the mx1 record, uses 5 as a priority, and the mx2 record uses 10 as a priority.
TTL
It is recommended to use the default, which is set to 14400 seconds (four hours).
After making any changes to your domain's DNS records, allow up to 24 hours for propagation to complete, and your email will start working with the new MX records 😊
How to Edit or Delete MX records
If you want to edit or delete an existing MX record, scroll down on the DNS Zone Editor to find the MX records or use the search bar:
Permanently delete a record
Modify the record's values
Additional resources: