Spam Bounce-backs From Your Site
Updated 2 July 2026
If you receive delivery failure notices for emails you did not send, your site may be sending spam via a compromised form or plugin.
When this happens, the priority is securing the site and your domain's email reputation before more damage is done.
Immediate actions
- Scan for malware and unknown admin users.
- Update all plugins and themes.
- Add SPF, DKIM, and DMARC records.
- Review form plugins for abuse or missing CAPTCHA.
Shield Pro includes malware prevention. See Fixing a Hacked Site.