How can I improve my email authentication to prevent 550 errors?

Implementing proper email authentication protocols is crucial. This includes setting up SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting & Conformance). These protocols help verify that your emails are legitimately sent from your domain, reducing the chances of being marked as spam and rejected by recipient servers. Consult your email provider’s documentation for setup instructions.