{"id":4055,"date":"2025-05-14T08:21:58","date_gmt":"2025-05-14T08:21:58","guid":{"rendered":"https:\/\/www.warmy.io\/blog\/email-warm-up-checklist-for-new-domains-in-2025\/"},"modified":"2026-04-02T09:50:42","modified_gmt":"2026-04-02T09:50:42","slug":"email-warm-up-checklist-for-new-domains-in-2025","status":"publish","type":"post","link":"https:\/\/www.warmy.io\/blog\/email-warm-up-checklist-for-new-domains-in-2025\/","title":{"rendered":"Email Warm-Up Checklist for New Domains in 2026"},"content":{"rendered":"

Marketers with email campaigns in their toolbox know all too well that to be successful, it\u2019s essential to launch a new domain\u2014which is exciting. But if you start sending too many emails right away, they might just end up in the spam folder.<\/span><\/p>\n

In 2026, email service providers (ESPs) have leveled up when it comes to security and strict spam filtering mechanisms. There\u2019s no other way around it but to do it the right way: by warming up your domain before launching your first campaign or cold email.<\/span><\/p>\n

If you\u2019re a SaaS startup, eCommerce brand marketer, or B2B marketer, you\u2019re in the right place. This blog is your step-by-step email warm-up checklist for new domains in 2026. We will walk you through every stage. You\u2019ll learn how to prepare your domain, what to monitor, how to scale safely, and how tools like Warmy.io can automate the process with fewer risks.<\/span><\/p>\n

Let\u2019s make sure your domain starts strong\u2014and stays out of the spam folder.<\/span><\/p>\n

Why email warm-up matters for new domains<\/b><\/h2>\n

Before we discuss why warmup matters for new domains when it comes to email marketing, we need to answer one frequently asked question.<\/span><\/p>\n

Q: Why do you need a new domain for outreach in the first place?<\/span><\/i><\/p>\n

A: Using your primary business domain (the one your website and customer communications are already built on) for cold outreach is risky. If your outreach campaigns trigger spam complaints, high bounce rates, or poor engagement, your domain reputation can take a hit. Inbox providers could flag you and even blacklist your domain. This can then affect <\/span><\/i>all emails<\/i><\/b> sent from your company\u2014including support emails, transactional emails, client communications, and even order confirmations.\u00a0<\/span><\/i><\/p>\n

\ud83d\udd16 Related Reading:<\/b> Importance of Email Warmup before Cold Outreach<\/span><\/a><\/p>\n

This is why smart brands and marketers<\/span> create a new domain or subdomain dedicated <\/span>solely<\/span><\/i> to outreach. Then, they warm it up before sending any real campaigns. Done right, this protects your core domain while improving inbox placement, and increasing the chances of outreach success.\u00a0<\/span><\/p>\n

Here are other reasons why email warm-up is beneficial for new domains:<\/span><\/p>\n

It helps you avoid the spam folder<\/h3>\n

When inbox providers identify that an email has been sent from a new domain, they treat it with caution. After all, there\u2019s no sending history. There\u2019s no credibility or authority\u2014yet. So when a new domain sends bulk emails right away, inbox service providers may flag your domain or your email address as spammy and suspicious. When this happens, the next emails you will send have a higher chance of landing in spam or <\/span>getting blocked<\/span><\/a>.<\/span><\/p>\n

Warming up your domain tells ESPs that you\u2019re a legitimate sender. It introduces your domain gradually, using safe sending patterns and positive engagement signals like opens and replies. This builds trust over time\u2014and trust is the key to staying out of spam.<\/span><\/p>\n

\ud83d\udd16 Related Reading: T<\/b>he Warmy Research Team recently conducted an experiment to examine how different warm-up strategies affect the deliverability of emails from newly created domains. You can access the full report here:<\/span> The Science and Process of Warming Up Newly Created Email Domains<\/span><\/a>.<\/span><\/p>\n

Building a positive sender reputation<\/h3>\n

Sender reputation is another factor that affects overall deliverability. So for new domains, this can be a challenge as they have no reputation yet. In the world of emails and inboxes, sender reputation is like a credit score. It is built over time and it\u2019s based on how recipients interact with your emails and your domain.\u00a0<\/span><\/p>\n

A new domain starts with a neutral reputation. Warming it up helps shape a reputation positively from day one. Over time, inbox providers start recognizing your domain as safe and trustworthy. This will also help you improve deliverability in the long run. Skipping this step and blasting emails to large lists right away is one of the fastest ways to burn your domain\u2014and your chance to reach inboxes consistently.<\/span><\/p>\n

Ensuring long-term email deliverability<\/h3>\n

Email warmup isn\u2019t just a one-time big-time project. It\u2019s the foundation for long-term deliverability. A well-warmed domain continues to perform better, even as you scale up your campaigns. When done correctly, warm-up helps you:<\/span><\/p>\n