Programming Tutorials

  The most critical vulnerability in modern web infrastructure isn't always a compromised database; often, it is the inability to communicate reliably with users. If you are hosting custom domain emails on Hostinger, you may have noticed a disturbing trend: transactional emails, invoices, and password resets landing directly in the recipient's Spam folder. This is not bad luck. It is a failure of authentication. Email providers like Google and Microsoft enforce strict reputation checks. If your domain cannot cryptographically prove it authorized a message, the email is treated as a spoofing attempt. To solve this on Hostinger, you must manually align three specific DNS protocols:  SPF  (Sender Policy Framework),  DKIM  (DomainKeys Identified Mail), and  DMARC  (Domain-based Message Authentication, Reporting, and Conformance). The Root Cause: Why SMTP is Inherently Insecure To understand why your emails are blocked, you must understand the protocol they...