Enabling DNSSEC can introduce operational complexities, potentially leading to configuration errors and DNS resolution disruptions, although signing zones is straightforward with good DNS system support. If DNSSEC is not implemented correctly or if the resolving service has broken DNSSEC, queries may fail, causing partial outages. While DNSSEC offers an extra layer of assurance, it's not a complete solution for email protection without proper authentication, and it may introduce a performance overhead. Proper key management and DNS system support are crucial to avoid issues, but if TLS is in place, DNSSEC may not offer much additional benefit.