The upstream provider has resolved the issue, and email sending is working as normal.

Due to an issue with an upstream provider, we are currently experiencing issues sending emails, including those related to free plugin registrations. We will provide further updates as they become available.

Users may still request free licenses via the Licenses page in Wordfence Central, or use the fallback method in the Wordfence Free registration dialog. Please refer to https://www.wordfence.com/help/api-key/#installing-your-free-license-key for additional details.