Your server firewall, security module (like ModSecurity), or outbound proxy is blocking requests to https://www.mailwizz.com .
If you’ve recently purchased MailWizz Email Marketing Application (self-hosted version), you’ve probably received a long alphanumeric string labeled your MailWizz license key . But what exactly is this key, how does it work, and why does your installation stop functioning without it? mailwizz license key work
Your license key is registered to mailer.yourcompany.com , but you’re trying to run MailWizz on newsletter.yourcompany.net or on a temporary IP address. Your server firewall, security module (like ModSecurity), or
Copy-paste errors, extra spaces, or using a key from a different product (e.g., MailWizz extension key instead of main app key). Your license key is registered to mailer
| Checkpoint | Action | |-------------|--------| | | Update to the latest stable version. Old versions may have broken validation endpoints. | | PHP version | Use PHP 7.4 or 8.x (as per MailWizz requirements). | | Server time | Ensure your server clock is synchronized via NTP. Time skew can break SSL handshakes. | | OpenSSL | PHP OpenSSL extension must be enabled. | | License server status | Visit https://status.mailwizz.com to check if license API is down. | | Support ticket | Open a ticket with your license key and server logs. | Frequently Asked Questions (FAQ) Q: How often does MailWizz check the license key? A: By default, every 24 hours via the main cron job. However, some actions (like adding a new customer or sending a campaign) may trigger an immediate check. Q: Can I use the same license key on a staging site? A: Yes, if your staging site is a subdomain of the registered domain (e.g., staging.app.yourdomain.com ). For completely different staging URLs, contact MailWizz support for a temporary key. Q: Will my license key work if I move to a different server? A: Yes, as long as the domain remains the same. The license is bound to the domain name, not the server IP. After migration, simply re-enter the license key to refresh validation. Q: What happens if MailWizz’s license server goes down? A: MailWizz implements a grace cache. If the license server is unreachable, your installation will continue to work for up to 72 hours using the last known valid response. Q: How does the MailWizz license key work with load balancers? A: As long as all servers behind the load balancer share the same database and the domain name is consistent, a single license key works fine. No per-server licensing. Conclusion: Mastering Your MailWizz License Key Understanding how a MailWizz license key works is essential for any email marketer or agency running this powerful platform. Unlike simple "copy-paste and forget" licenses, MailWizz uses a dynamic, cron-driven validation system to ensure compliance while offering flexibility for subdomains and developer use cases.