Resolving Email Authentication and Domain Reputation Issues

Introduction

If your emails are being marked as spam, delayed, or undelivered, it's often due to issues with email authentication or your domain's reputation. At IT Solver, we help small businesses in Australia diagnose and resolve these challenges to ensure your emails reach their intended recipients reliably.

Issue description

Common email authentication problems include expired SSL certificates, incorrect SPF, DKIM, and DMARC configurations, and domain reputation blocks that prevent successful email delivery.

Signs of email authentication and domain reputation issues

• Emails frequently land in recipients' spam or junk folders.
• Significant delays in email delivery or bounced messages.
• Receiving error notifications about SPF, DKIM, or DMARC failures.

Basic troubleshooting steps

• Check that your SSL certificates are valid and up to date.
• Verify SPF record includes all your sending IP addresses.
• Confirm DKIM signing is correctly set up for your domain.
• Ensure DMARC policy is configured to monitor and protect against spoofing.

Advanced troubleshooting steps

Our technical team at IT Solver can perform in-depth diagnostics and take the following actions:

1. Review and renew any expired or soon-to-expire SSL certificates governing your email domain.
2. Audit and reconfigure SPF, DKIM, and DMARC DNS records for alignment and compliance.
3. Investigate domain reputation status and set up new domains if needed to bypass blocks.
4. Implement best practices for email sending to improve deliverability and maintain good reputation.

Known issue: DKIM delay after switching email providers

If you recently switched your email platform — for example, from Google Workspace to Microsoft 365 — DKIM records from your previous provider do not carry over automatically. This can cause emails to land in recipients' junk or spam folders even if your domain was previously configured correctly.

Symptoms:

• Emails landing in junk folders shortly after migrating to a new email provider.
• DKIM failure notices despite the domain previously passing authentication checks.

Resolution:

1. Log in to your new email provider's admin portal (e.g., Microsoft 365 Admin Center).
2. Navigate to the DKIM settings for your domain and generate new DKIM keys.
3. Add the provided CNAME records to your domain's DNS settings.
4. Enable DKIM signing in the admin portal once the DNS records have propagated.
5. Verify all security checks (SPF, DKIM, DMARC) are passing using a tool such as MXToolbox.

Once DKIM is active and all security checks are passing, the issue is resolved and emails should deliver correctly to recipients' inboxes.

Contact IT Solver for assistance

If you're experiencing issues with email authentication or domain reputation, don't hesitate to get in touch with IT Solver. Our friendly and professional team will leverage first principles thinking to identify root causes and provide clear, actionable solutions that simplify your technology management and restore your email reliability quickly.

Visit our website at https://itsolver.net/ to request support or consultation.