Spam Bounce-backs From Your Site
An unexpected delivery failure notice does not always prove that WordPress sent the original message. A sender may have spoofed your address, or mail may have come from a compromised mailbox, abused form, plugin or website account.
Review the bounce message
- Check the sending time, claimed sender and delivery error.
- Review message headers or mail-provider logs for the system that actually sent it.
- Look for an unusual volume of messages rather than relying on one bounce.
- Do not open unexpected attachments or sign-in links inside the returned message.
Check each possible source
- Review mailbox sign-ins, forwarding rules and sent mail.
- Check WordPress forms and submission logs for automated abuse.
- Review site users, recently changed files and security alerts.
- Confirm that SPF, DKIM and DMARC match the services authorised to send for the domain.
Respond to the finding
If a mailbox is affected, secure it with the email provider. If a form is being abused, strengthen its spam controls and rate limits. If WordPress shows unfamiliar changes, follow Fixing a Hacked Site. Read Create an SPF Record before changing sender authorisation.
Common questions
Frequently Asked Questions
Does a bounce-back prove my website sent spam?
No. The sender address may have been spoofed. Mail headers and provider logs can help identify where the original message was sent.
Why am I receiving hundreds of delivery failures?
A large campaign may be spoofing your address, or an account, form or website may be sending unwanted mail. Review provider and website logs promptly.
Will SPF stop every spoofed message?
No. SPF helps receiving systems evaluate authorised senders, but effective domain protection also uses DKIM, DMARC and secure accounts.
When should I suspect the WordPress site?
Investigate WordPress when mail logs point to the website, forms show abuse, unfamiliar users or files appear, or security monitoring reports unexpected changes.