MX record specifies mail servers that handle incoming emails. If you want to use Hostinger servers to receive emails sent to your domain, you need to set Hostinger’s MX records.
Hostinger MX records are:
Value (Mail Server)
You can always see default MX records for your account by navigating to Emails → domain name → Email Delivery, just click on the arrow near MX:
If your Emails section looks this way:
It means you are using Titan Email and MX records will be: