Our blog shares expert insights on email security, DMARC configuration, and deliverability optimization.
Set up HubSpot email authentication with two DKIM CNAME records, an account-specific SPF include, DMARC, and an aligned sending domain.
An MX record is the DNS entry that tells the rest of the internet which mail servers receive email for a domain. Here is how MX records work, what each field means, and why priority matters.
Phishing is broad impersonation. Spear phishing is targeted impersonation built around a specific person, role, vendor, or business process. Learn the difference, how executive phishing fits in, and where DMARC helps.
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 domain authentication with two account-specific DKIM CNAME records, one DMARC TXT record, and a real campaign test.
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.
Hire an email deliverability consultant who has shipped billions of emails. Free assessment, hands-on engagement, written quote before any work starts.
We use cookies to enhance your experience, analyze site traffic, and for marketing purposes. You can choose which optional cookies to allow. Learn more in our Cookie Policy.
Manage your cookie preferences below. Essential cookies are always active as they are required for the website to function.
Required for the website to function. Cannot be disabled.
Remembers which page, referring site, or campaign first brought you here. First-party only, never shared with third parties.
Help us understand how visitors interact with our website.
Used to measure advertising effectiveness and track affiliate referrals.
Learn more about how we use cookies in our Cookie Policy.