Why does Google Postmaster Tools suddenly show 0% authentication?

Email marketer from MXToolbox explains that if your domain is blacklisted, it can severely impact your authentication results. Use MXToolbox to check if your domain is on any blacklists and take steps to get removed if necessary.

Email marketer from SendGrid explains that issues with subdomain configuration can cause authentication issues. If you are using a subdomain for sending emails, make sure that the SPF and DKIM records are correctly configured for that subdomain.

Email marketer from ReturnPath explains that a sudden spike in spam complaints can negatively affect your sender reputation and authentication rates. Monitor spam complaint rates and investigate the cause of any sudden increases.

Email marketer from Email on Acid explains that if DKIM keys have been rotated or are outdated and not updated in DNS records, authentication will fail. They recommend ensuring that DKIM keys are current and properly configured in both the email sending server and DNS records.

Email marketer from Reddit User explains that changes in your email sending infrastructure (e.g., switching ESPs or modifying server configurations) can impact authentication. They advise checking if any recent changes were made and ensuring that SPF, DKIM, and DMARC records are correctly configured for the new setup.

Email marketer from Google Support Community shares that Google Postmaster Tools may experience temporary glitches, leading to inaccurate authentication reporting. They advise waiting a few days to see if the issue resolves itself before making any drastic changes.

Email marketer from Mailjet explains that a sudden drop to 0% authentication in Google Postmaster Tools (GPT) could be caused by incorrect DMARC policies which may negatively impact authentication results. They suggest reviewing DMARC settings and ensuring they are correctly configured.

Marketer from Email Geeks agrees with Ken and suggests using a service like dmarcian to monitor DMARC reports in a user-friendly interface.

Email marketer from Litmus explains that when using shared IP addresses through an ESP, the actions of other senders on the same IP can impact your authentication. Investigate whether there have been any changes in the shared IP environment or if the ESP has had any deliverability issues.

Email marketer from Stack Overflow User explains that misconfigured SPF records, especially those with incorrect IP addresses or domain inclusions, can cause authentication failures. They suggest verifying the SPF record to ensure it accurately reflects all authorized sending sources.

Marketer from Email Geeks recommends enabling DMARC in report-only mode (p=none) and using a service to analyze the reports to monitor email authentication effectively.

Marketer from Email Geeks explains that if the client uses an ESP, Google Postmaster might track authentication on the sending domain from the ESP, not the client's actual domain, potentially causing authentication to drop to 0%, especially for SPF.

Email marketer from GlockApps explains that if the sending IP address has a poor reputation due to being blacklisted or associated with spam, it can affect authentication and deliverability. Monitor the IP address reputation using tools and take steps to improve it if necessary.

Marketer from Email Geeks suggests that the issue might be due to a mail source sending over 100 messages to Google without aligned SPF and DKIM, and also notes that Google Postmaster Tools can be buggy, so it's best to monitor the situation for a few days and cross-reference with other data sources.

Expert from Spam Resource (referring to John Levine's expertise) explains that transient network or system issues can sometimes affect the visibility of authentication results within Google Postmaster Tools. He suggests monitoring the situation for a short period to determine if the issue resolves itself before troubleshooting.

Expert from Word to the Wise (referring to Laura Atkin's expertise) explains that a sudden drop in authentication could be due to a sudden decline in domain reputation causing Google to be more strict with filtering. She suggests ensuring your sending practices are sound and investigating reputation monitoring tools.

Documentation from Google Workspace Admin Help explains that a missing or misconfigured PTR (Pointer) record, which maps an IP address to a domain name, can sometimes cause authentication problems. Ensure that the sending server's IP address has a corresponding PTR record that resolves to the sending domain.

Documentation from Microsoft explains that Sender ID, an older email authentication method, if failing can contribute to a lower authentication rate in Google Postmaster Tools. While DMARC, SPF, and DKIM are more important, ensuring Sender ID is correctly configured can help improve overall deliverability.

Documentation from RFC 7489 (DMARC Standard) explains that incorrect implementation of DMARC, including syntax errors in the DMARC record or issues with how DMARC policies are applied, can negatively impact authentication results. Validate the DMARC record using online tools to check for errors.

Documentation from DMARC.org explains that DMARC (Domain-based Message Authentication, Reporting & Conformance) policy failures, such as messages failing SPF or DKIM checks and not aligning with the domain in the 'From' header, can lead to authentication issues reported by Google Postmaster Tools. Review DMARC reports to identify the source of failures.