Work from the outside in and change one thing at a time. Record the exact error, affected hostname, time, network, browser, and recent changes.
Website checks
- Confirm the domain resolves to the intended server.
- Test both HTTP and HTTPS and note status codes or certificate errors.
- Check whether the issue affects one page, the entire site, or only signed-in users.
- Review application and server error logs around the failure time.
Email checks
- Confirm MX, SPF, DKIM, and DMARC records match the active provider.
- Test both sending and receiving with an unrelated external mailbox.
- Distinguish authentication errors from delivery delays, spam filtering, and bounces.
A support ticket is most effective when it includes the domain, service, exact error, timestamp, reproduction steps, and relevant non-sensitive log lines.
