Understanding Hesk Email Delivery Mechanisms

Hesk relies on PHP's mail() function by default to send emails. While this method is straightforward, it often leads to delivery issues, especially when emails are flagged as spam or fail to reach their destination. The PHP mail() function does not provide authentication, which can result in emails being marked as untrusted by recipients' mail servers. To ensure reliable email delivery, configuring SMTP (Simple Mail Transfer Protocol) with proper authentication is essential. SMTP allows Hesk to send emails through a trusted mail server, significantly improving deliverability.

Configuring SMTP in Hesk

To configure SMTP in Hesk, navigate to the Admin panel and go to Settings > Email tab. Set the Send emails using option to SMTP Server. Enter the SMTP host, port, username, and password provided by your email service provider. For example, if you're using Gmail, the SMTP host would be smtp.gmail.com, the port 465, and your Gmail credentials as the username and password. Ensure the From Email address in the General tab matches the SMTP username. This alignment prevents discrepancies that could lead to email rejection.

Resolving Common SMTP Connection Issues

If you encounter issues testing the SMTP connection, verify the following:

  • Ensure your hosting provider allows connections to external SMTP servers. Some providers restrict outgoing SMTP connections for security reasons.
  • Check if the SMTP port is blocked by the server firewall. Common ports include 25, 465, and 587. Experiment with different ports and SSL/TLS settings based on your email provider's recommendations.
  • For Gmail users, enable App Passwords if you're using two-factor authentication. This generates a unique password for SMTP authentication, bypassing the need for your primary Gmail password.

Using tools like Mail Tester can help diagnose email delivery issues by analyzing your email's SPAM score and providing actionable feedback.

Ensuring Proper DNS Configuration

Proper DNS configuration is critical for email deliverability. Ensure your domain has valid SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) records. SPF verifies that emails sent from your domain originate from authorized servers, while DKIM adds a digital signature to verify the email's authenticity. Additionally, configure a DMARC (Domain-based Message Authentication, Reporting, and Conformance) policy to instruct receiving mail servers on how to handle emails that fail SPF or DKIM checks. These DNS records work together to establish trust with recipients' mail servers, reducing the likelihood of emails being marked as spam.