Warming Up IPs: What Every Marketeer Should Know Before Hitting Send

​
​Email marketing still punches above its weight when it comes to conversions and customer retention.

But if your emails aren’t reaching inboxes, none of that matters. One of the most overlooked steps in launching a successful campaign, especially from a new domain or IP address, is warming up your IP.

It’s not just about sending. It’s about sending smart.

​Find out more in this blog and download my IP Warm-Up Checklist.

---

What Does “Warming Up” Mean?

​In plain terms, warming up an IP means gradually increasing the volume of email sent from a new or previously unused IP address.

​This slow build allows mailbox providers like Gmail, Outlook and Yahoo to get used to your sending behaviour and to determine that you’re a trusted sender—not a spammer.

Why Is It So Important?

​If you suddenly send out thousands of emails from a cold IP, alarm bells ring. Internet service providers will likely mark your messages as suspicious, damaging your sender reputation and deliverability. That’s a hard fix once it’s broken.
​
You’ve spent time creating great content and building your list. Warming up your IP is the first layer of protection to ensure your message actually gets seen.

When Do You Need to Warm Up an IP?

• You’re switching from one email marketing tool to another
• You’ve just set up a dedicated IP address
• You’ve added a new domain for a different brand or business
• You’ve had a long gap in email activity
• You’ve cleaned or rebuilt your list after a data cleanse

​
Even platforms like HubSpot and Mailchimp benefit from this approach when using dedicated sending infrastructure.

The IP Warm-Up Process

Here’s a basic structure for warming up your IP:

Week 1

Start small. Send to your most engaged contacts—those who regularly open, click and respond to emails. This signals to mailbox providers that your content is relevant and welcome.
​
Example: 100–250 emails per day for the first few days.

Week 2

Increase volume by 50–100% every few days, while still prioritising highly engaged segments. Monitor bounce rates, opens and complaints. If performance dips, pause and reassess.

Week 3-4

Introduce more of your list, including newer contacts, while continuing to monitor engagement closely. Use segmentation, avoid over-mailing, and keep content relevant.
​
Be consistent with timing, sender name and content quality. This isn’t the time to experiment wildly with formats.

Tips to Warm Up Without Burning Out

• Authentication is key. Make sure SPF, DKIM and DMARC records are properly set. These help validate your domain and reduce spoofing.
• Use a preference centre. Let people manage frequency and topics—this keeps engagement high.
• Avoid attachments and too many links. These are common red flags for spam filters.
• Personalise where possible. Emails that read like they’re for a specific person tend to perform better.
• Keep a close eye on hard bounces and spam complaints. These are direct indicators that your sender reputation might be at risk.

Should You Use a Dedicated or Shared IP?

That depends. Shared IPs are often fine for smaller senders, especially when paired with platforms like Mailchimp or Campaign Monitor. But if you’re sending high volumes regularly, a dedicated IP (paired with a warm-up plan) gives you more control and consistency.
​
Just be aware that a dedicated IP comes with responsibility. You’re the only one affecting its reputation.

Final Thoughts

Warming up your IP isn’t just technical housekeeping. It’s an essential part of your email marketing strategy that underpins delivery, reputation and results.

If you skip it, you’re risking everything you’ve built. If you do it right, you’ll build a reputation that supports campaign success in the long term.

Smart sending isn’t just about what you say; it’s also about how you deliver it.

Download the IP Warm-Up Checklist

#emailMarketing #MarketingTips # MarketingStrategy #DigitalCampaigns