Our blog shares expert insights on email security, DMARC configuration, and deliverability optimization.
Set up DKIM for Office 365 and Microsoft 365 with selector CNAME records, the Defender portal, Exchange Online PowerShell checks, and DMARC alignment verification.
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.
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.
Set up Mailchimp DKIM by verifying your domain, publishing Mailchimp's two CNAME records, adding DMARC, and checking authentication status.
Set up Salesforce DKIM by creating primary and alternate selectors, publishing CNAME records, activating the key, and verifying DMARC alignment.
Angler phishing is a social-media scam where fake support accounts target people who publicly ask brands for help. Learn how it works, how to verify support accounts, and how baiting and pharming differ.
MTA-STS breaks when DNS, HTTPS policy hosting, and MX TLS drift out of sync. This troubleshooting guide covers seven failures, the records to check first, and the commands that expose them.
DMARC secures who sends as your domain. Receiver Shield secures how mail is delivered to it. We added hosted MTA-STS and TLS-RPT monitoring to DMARCTrust.
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.
Every day I answer support tickets. Most of the time, the real problem is bigger than what a monitoring tool can solve alone. Today, we're making our consulting service available to everyone.
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.
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.
Hire an email deliverability consultant who has shipped billions of emails. Free assessment, hands-on engagement, written quote before any work starts.
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