AuthEmailTest.comEmail Delivery Diagnostics

What This Test Can See

The report observes the real SMTP connection and received message. It checks the connecting IP and HELO, PTR and forward-confirmed reverse DNS, STARTTLS, SPF, DKIM, DMARC, ARC, message and MIME formatting, unsubscribe headers, message-level best practices, and the local Rspamd and SpamAssassin results.

What This Test Cannot See

Mailbox providers keep important reputation and filtering information private or make it available only to a verified domain or IP owner. AuthEmailTest.com does not have visibility of:

• Google, Microsoft, Yahoo or another provider's private IP and domain reputation.
• Your provider-wide or shared-IP reputation.
• Spam complaint, hard-bounce, soft-bounce, unsubscribe or spam-trap history.
• How recipients joined the list, whether they consented, or whether inactive and invalid recipients are suppressed.
• Sending volume, warm-up, rate, consistency, retry behaviour or sudden traffic changes.
• Recipient engagement and the final inbox, junk, deferred or rejected outcome at another provider.

These are unavailable signals, not failed checks. Rspamd, SpamAssassin and public blocklist signals we do use can provide useful snapshots, but they are not substitutes for a mailbox provider's private reputation data.

What You Can Do

• Use Google Postmaster Tools for available Gmail reputation, spam-rate, authentication and delivery information for a verified sending domain.
• Use Microsoft SNDS for available Outlook.com sending-IP data and junk-email feedback when you control the IP.
• Register eligible DKIM domains with the Yahoo Complaint Feedback Loop and follow the Yahoo sender requirements.
• If you use AuthSMTP or another email service provider, review its bounce, complaint, suppression and delivery information; shared sending-IP data may be visible only to that provider.
• Stop sending to hard bounces, complaints and unsubscribed recipients, monitor repeated soft bounces, and keep permission and subscription records.
• Build volume gradually, send consistently, and maintain controlled Gmail, Outlook and Yahoo test mailboxes for real placement checks.
• Monitor DMARC aggregate reports sent to the address in your policy's rua tag to find authentication failures across real traffic.

Additional Deliverability Checklist

Outgoing.email provides a broader 26-point checklist covering permission, list quality, bounces, complaints, reputation monitoring, sending patterns, engagement, content and unsubscribe handling.

Review the Outgoing.email checklist