A MailWizz license key is a unique alphanumeric string that authenticates your copy of the software. When you purchase MailWizz from the official website (mailwizz.com), you receive a license key tied to your domain name and your customer account.
| Error Message | Likely Cause | Solution |
| :--- | :--- | :--- |
| "The license code you provided is invalid" | Incorrect key format or wrong Envato purchase code. | Copy exact key from CodeCanyon "License Certificate". Remove spaces. |
| "Could not connect to license server" | Server firewall blocks outbound HTTPS. | Whitelist api.envato.com and www.mailwizz.com in firewall. |
| "License expired" | Support/updates period has lapsed. | Renew license via CodeCanyon or switch to the "Extended" license. |
| "Local license mismatch" | Domain changed after installation. | Re-run license validation or edit main-custom.php and clear cache. |
| License valid, but updates fail | Incorrect main-custom.php location. | Ensure file is in /apps/common/config/, not /apps/config/. |
Before you even attempt a MailWizz license key install, ensure your environment meets the requirements. A failed install is often due to server misconfiguration, not an invalid key. mailwizz license key install
So you’ve purchased a MailWizz license—congratulations! You are now the proud owner of one of the most robust self-hosted email marketing applications available. However, before you can launch your first campaign, you need to validate your installation by entering your license key.
If you are staring at the dashboard wondering where to put that long string of characters, or if you are encountering a "License Invalid" error, this guide is for you. A MailWizz license key is a unique alphanumeric
Here is exactly how to install and verify your MailWizz license key.
1. "Invalid License Key" Error
2. "Unable to verify license" / Connection Error
3. "License already in use"