free-tools
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How to look up MX records (3 ways)
Three ways to look up MX records for any domain: a free MX records lookup tool, dig and nslookup from a terminal, and a few lines of Ruby or Python.
DT
DMARCTrust
Articles tagged Email Deliverability
Our blog shares expert insights on email security, DMARC configuration, and deliverability optimization.
email-deliverability
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What does queued mean in Gmail? Why emails get stuck and how to fix it
Seeing queued in Gmail usually means your message is waiting in the Outbox because Gmail cannot send it yet. Here are the common causes, safe fixes, and when to check SPF, DKIM, or DMARC.
DT
DMARCTrust
email-deliverability
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Five new troubleshooting guides for when DMARC breaks
We published five troubleshooting guides covering SPF errors, DKIM failures, alignment issues, forwarding breakage, and the full p=none to p=reject migration. Each one follows the same format: symptom, diagnosis, solution, prevention.
DT
DMARCTrust
dmarc-setup
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What is the Return-Path, and why does it matter for DMARC?
The Return-Path is not the address your users see, but it still plays a critical role in email authentication. Learn how the SMTP envelope, SPF, bounces, and DMARC alignment fit together.
DT
DMARCTrust
email-deliverability
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SPF flattening: how DMARCTrust's SPF Optimizer keeps your email flowing
Every include in your SPF record costs a DNS lookup. Hit 10 and every email from your domain fails SPF. The SPF Optimizer resolves your includes into IPs automatically so you never blow the budget.
DT
DMARCTrust
email-deliverability
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DMARC for agencies and MSPs: managing email security across multiple client domains
Marketing agencies, MSPs, and IT consultants face a unique challenge: implementing DMARC at scale. One client is manageable. Twenty clients, each with their own ESPs, DNS providers, and compliance requirements? That requires a system.
DT
DMARCTrust
dmarc-setup
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SPF failed: why it happens and how to fix it
SPF failures show up in your DMARC reports or email headers, but the reason is not always obvious. We break down the common causes of SPF failures and walk through practical troubleshooting steps.
DT
DMARCTrust
email-deliverability
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Google DMARC check: verify your domain meets Gmail's requirements
Gmail now requires DMARC for bulk senders. Learn how to check if your domain passes Google's email authentication requirements, fix common issues, and monitor your DMARC status.
DT
DMARCTrust
email-deliverability
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The 2026 email deliverability stack: 4 tools that actually matter
Sending emails is no longer enough. Gmail, Yahoo, and Microsoft now require authentication, clean lists, and proper reputation. Here's the complete stack to ensure your emails actually reach the inbox.
DT
DMARCTrust
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