WordPress
WordPress email problem: how to trace message delivery
A WordPress form saying “message sent” may only mean the application handed a message to the next layer. Reliable troubleshooting follows the message from WordPress through the sending service and DNS authentication to the receiving mailbox.
Confirm WordPress generated the message
Test a password reset or controlled mail action and review the application/plugin logs. If WordPress fails before submission, changing SPF or DMARC will not fix the application error.
Use an intentional SMTP or transactional path
Important website mail should use a sending service or server configuration with known credentials, TLS, rate limits, and logs. Record which hostname, port, authentication method, and sender identity the site is configured to use.
Verify the domain records for the actual sender
SPF, DKIM, and DMARC need to reflect the systems that legitimately send mail for the domain. Do not paste a generic record from another provider or publish multiple conflicting SPF records.
Test receipt, not just submission
Send representative mail to external providers and inspect headers, authentication results, bounces, spam placement, and reply paths. A successful SMTP handoff is not the same as inbox delivery.