Warm Up Your Sending Domain or Dedicated IP

When you start using a new sending domain or dedicated IP, it may carry a neutral or unestablished reputation with Internet Service Providers (ISPs). Gradually increasing your email volume—also known as “warming up”—helps build trust, avoid spam filters, and improve deliverability.

Why Warming Up Matters

• ISPs monitor new sending sources closely. Sending large volumes abruptly often triggers spam filtering or blocking.

• A slow ramp-up helps your domain/IP establish a positive reputation over time.

• Failing to warm up properly can harm your reputation and require months to recover.

Recommended Warm-Up Schedule

We recommend starting with around 200 emails per day and then gradually increasing the volume over time. This approach helps build a positive reputation with inbox providers and reduces the chances of your emails landing in spam.

This is a generalized warm-up plan designed for new sending domains or dedicated IPs.

Your dedicated account manager will provide you with a custom warm-up plan tailored to your sending needs, list size, and engagement levels.

The table below shows a sample warm-up schedule beginning with 200 emails per day and scaling up over time.

What happens if I skip the warm-up?

Jumping straight into sending large volumes without warming up can trigger spam filters and even get your emails blocked by inbox providers. Chances are, your emails may also land in the spam or junk folder. This damages your domain or IP reputation and may take months to recover.

Re-Warm After Inactivity

If your domain or IP hasn’t been used for 30 days or more, it likely loses its warmed-up reputation. You’ll need to restart the warm-up process from scratch.

Best Practices

To keep your domain or IP warmed, make sure you’re sending emails at least two times a week. Staying consistent helps maintain your sender reputation and prevents your domain or IP from going cold, which could otherwise require restarting the warm-up process.