What is DMARC? A practical guide for anyone sending real email in 2026
DMARC is a small text record you publish in your domain’s DNS that tells receiving mail servers what to do if a message claiming to be from your domain fails SPF or DKIM checks.
Posts for June 2026
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How to Stop Emails Going to Spam: The 2026 Playbook From 20 Years in SMTP
If your emails are landing in spam, the cause is almost always one of seven things: missing or misconfigured authentication, a damaged sender reputation, a high complaint rate, a dirty or purchased list, a brand-new or cold-warmed domain, a content or link pattern that trips filters, or an SMTP provider that’s quietly making things worse....
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What Is Transactional Email? Examples, the Rules, and How to Send Them Reliably
A transactional email is an automated message triggered by something a specific person did, or something that happened to their account, and it carries information they’re expecting or that they need to complete an action. Receipts. Password resets. Shipping updates. Two-factor codes.
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New Email API Features for Smarter, Faster Email Sending
We’ve made several new enhancements to our email API features, designed to give you more control, better performance and greater flexibility when sending emails at scale.
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Email Unsubscribe Best Practices in 2026: What Changed, What Matters, What to Build
The rules quietly changed in February 2024. If your unsubscribe guide is older than that, it’s giving you 2014 advice for 2026 inboxes.
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Gmail Blocked in China? How to Keep Sending Email That Actually Arrives
Short answer: Yes, Gmail is still blocked in mainland China in 2026, the same as it’s been since 2014. If you need to read your inbox, you’ll want a VPN, an international eSIM, or roaming. But if your real problem is sending (an app, a website, a CRM, a printer, or just Outlook trying to...
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Email Attachment Size Limits: What Actually Sends in 2026
Most email attachment size guides give you a number and call it done. The problem is that the number on the box isn’t the number that actually sends. Encoding adds weight, recipient servers have their own caps, and a 24 MB file can bounce off a 25 MB limit without ever reaching an inbox.
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