2026 Safe Sending Checklist

November 3, 2025

The inbox landscape is changing fast. Stricter filters, evolving reputation systems, and advanced authentication standards are making it harder for legitimate marketing emails to stay visible.

Use this quick checklist to make sure your team is ready for 2026.

1. Authentication & Domain Setup

  • SPF, DKIM, and DMARC records are correctly set up and aligned with your sending domain.
  • Each record passes validation when tested (use tools like MXToolbox or Mail-Tester).
  • A clear process exists for reviewing and updating DNS records after platform or domain changes.
  • You’re not sending both marketing and sales emails from the same root domain (use subdomains).

Why it matters: Proper authentication tells inbox providers you’re legitimate – and helps protect your brand from spoofing or phishing.

2. Sending Behavior & Volume

  • You’re monitoring daily and weekly send volumes – no sudden spikes.
  • New domains or IPs are gradually warmed up before scaling.
  • Large sends are segmented or staggered, not blasted all at once.
  • You’re not reusing “burned” or poorly performing sending domains.

Why it matters: Reputation is built on consistency. Spikes, unverified domains, and aggressive sending patterns trigger filters even for good senders.

3. Engagement Health

  • You regularly remove inactive contacts (no opens/clicks in 90–120 days).
  • Campaigns are targeted – not broad sends to “everyone.”
  • You’re monitoring engagement by domain (Gmail, Outlook, etc.) to catch early warning signs.
  • Reply rates, not just open/click rates, are part of your engagement review.

Why it matters: Inbox providers track how recipients engage. Strong engagement signals trust – and keeps your messages out of spam.

4. Content & Design

  • Subject lines are clear and human – no spammy triggers (ALL CAPS, “FREE,” “ACT NOW,” etc.).
  • You’re not overusing images or links that could trigger filters.
  • You include plain-text versions of your HTML emails.
  • Unsubscribe links are easy to find and actually work.

Why it matters: Even small content tweaks can affect inbox placement. Simplicity and transparency build deliverability trust.

5. Monitoring & Alerts

  • You test inbox placement regularly (Gmail, Outlook, Apple Mail).
  • You’ve set up alerts for DMARC or sender reputation drops.
  • You track metrics beyond delivery – like inbox rate and spam placement.
  • You review sending performance monthly with your ESP or deliverability partner.

Why it matters: Deliverability issues start small. Regular monitoring helps you catch and fix them before they hurt ROI.

💡 Pro Tip: Get Expert Eyes on Your Deliverability

Even the most careful teams miss things – especially as new filters and standards roll out. Working with a trusted deliverability consultancy ensures experts are continuously monitoring your sender reputation, domain health, and authentication status.

A proactive partner can detect red flags before they impact ROI, manage warmups or domain rotations safely, and fix issues before they snowball. It’s the fastest way to keep your sending safe and your campaigns performing year-round.

Final Note

Email deliverability in 2026 won’t reward senders who send the most – it will reward senders who send safely.

If you’d like a deeper audit or want to know how your current setup stacks up against 2026 standards, Senders can run a no-charge deliverability checkup to pinpoint risks early.

Senders Case Studies

Momofuku

Founded by chef David Chang, Momofuku is a renowned culinary brand with a nationwide presence, including restaurants and an online store with delicious goods. They ran into an issue with their email sending – high bounce rates and blocked sending.

  • Momofuku reached out to Senders to run a diagnostic test on their sending infrastructure and find the root cause.
  • Senders deliverability experts discovered an issue with their DMARC, which was preventing emails from being sent, as their WordPress wasn't aligned with their SPF.
  • Senders provided the most effective solution helping Momofuku restore safe sending, and suggested next steps to ensure everything keeps running smoothly on their end.
  • The client reported that Senders helped identify the problem and got them back on track.

Andrew Yeung

Where many others see a problem, Andrew sees an opportunity. His work may center around product leadership at Google (and previously Meta), but his true calling is all about bringing brilliant change-makers together.

  • Andrew hosted small-scale dinners for a handful of people at the peak of the pandemic in NYC, to enable safe connections during the most isolating times.
  • The Senders team made the necessary domain configuration adjustments, with a focus on the domain’s email authentication settings to enhance security and deliverability.
  • The SPF record was updated to strengthen authentication and reduce the chance of landing emails into spam.
  • As a result, the client now has better, more stable email deliverability and security.

Myrina.ai

Myrina.ai offers a cutting-edge range of AI-powered SaaS marketing and sales tools that cater specifically to female entrepreneurs and women-led businesses.

  • Aligning the client’s three domains with Amazon to make sure they are compatible.
  • Setting up a proper DMARC policy to protect their domains against unauthorized use and phishing scams.
  • Enhancing email deliverability and security.

Physician’s Choice

  • The client’s team spotted issues with DMARC failures in Google Postmaster.
  • The Senders deliverability team worked with the client to update the DMARC configuration to enable report collection.