What 10,000 domains actually publish for email authentication in 2026

<blockquote> <p><strong>TL;DR</strong><br /> SPF (Sender Policy Framework) is the first line of defense against email spoofing, allowing domain owners to declare which IP

<p>If you have been running cold outreach in 2025 or 2026 and your bounce rates suddenly jumped from 1% to 5-7% despite using a "premium" verification tool, this post is for

<p>A potential customer emails your client's sales address. Seconds later the message comes back: <strong>address not found</strong>, <strong>mailbox unavailable</strong>, or

<p>You know the drill. A customer complains their transactional emails land in spam. Or a B2B trial signup uses a throwaway address. Or someone asks "do we have DMARC set up

<p>NIS2 enforcement started in October 2024. There is no grace period. There is no "we're working on it" exemption for small businesses. If your organization falls under the

<p>Your mail server works. Postfix starts, the logs look clean, you send a test message to your Gmail — and it lands in spam. Or it just disappears. Nothing in your config is

<p>Short answer: put each user reminder on a queue, make the consumer idempotent, retry transient delivery failures with backoff, and move exhausted work to a dead-letter queue