One-fifth of all cold email marketing campaigns have an open rate of 20% or less.

To get better open rates than this, it’s important to warm-up your email and consistently monitor your deliverability.

Here are the 12 best email warmup and deliverability tools that can help improve your open rates:

Tool

Free trial

Entry price

Sender reputation monitoring

Personalized warm-up emails

Warm-up network tailored to your industry

Blacklist monitoring

Technical setup check

lemwarm

❌

$29/month

✅

✅

✅

✅

✅

Folderly

✅

$120

✅

❌

❌

❌

✅

Warmbox

❌

$19/month

✅

❌

❌

✅

✅

Mailreach

❌

$19.5/month

✅

❌

❌

✅

✅

Warmup Inbox

✅

$19/month

✅

❌

❌

✅

✅

Mailwarm

❌

$69/month

❌

❌

❌

✅

❌

Warmy

✅

$49/month

✅

❌

❌

✅

✅

Inboxally

❌

$149/month

❌

❌

❌

❌

❌

Allegrow

❌

?

✅

❌

❌

❌

✅

Mailivery

✅

$29/month

✅

❌

❌

❌

✅

TrulyInbox

✅

$39/month

✅

❌

❌

❌

❌

Warm Up Your Email by Mailshake

❌

$29/month

❌

❌

❌

✅

lemwarm is an email warm-up and all-round deliverability tool.

Developed by a team of email outreach experts, lemwarm offers advanced email deliverability features that other warm-up tools lack.

✅ Pros

❌ Cons

Fix deliverability issues ASAP

Essential plan doesn't give you access to advanced features

Advanced warm-up features

Affordable

Folderly markets itself as an email deliverability ecosystem that consists of several products.

Folderly analyzes your emails, and if there’s a deliverability issue, it helps you devise a plan to combat it.

✅ Pros

❌ Cons

Goes beyond warm-up

Expensive

Free test plan for Inbox insights

Separate products to purchase

Supports custom providers

Folderly has a learning curve to it

Warmbox can help you improve email deliverability for new sending domains.

With a network of 35,000 inboxes to send your warm-up emails to and GPT-4 generated warm-up emails, Warmbox is worth a look if you’re experiencing low open rates.

✅ Pros

❌ Cons

Affordable basic plan

Complicated plan structure

Customizable warm-up options

Bad English on their website doesn’t inspire trust

Chat support

The next email warm-up tool, Mailreach, uses machine learning to optimize your deliverability.

It also uses 20,000 inboxes from real accounts to send the warm-up emails to.

✅ Pros

❌ Cons

User-friendly interface

Additional Spam Checker credits at additional cost

Smart warming algorithm takes care of the warm-up process

No personalized warm up

No technical skills required

With 30,000 inboxes to send warm-up emails to, Warmup Inbox has one the most extensive networks.

It allows you to warm-up your own templates, which allows you to maintain consistency in your email content and build familiarity with ESPs.

✅ Pros

❌ Cons

Try for free

Limited basic plan

Good support

No technical setup check

Use your own templates for warm-up

Mailwarm is a basic warm-up tool without advanced features.

Its network of 1,000 warm-up inboxes is also quite small.

✅ Pros

❌ Cons

Easy setup

Only basic warm-up features

Intuitive user interface

Expensive: cheapest plan goes for $79/month for 1 inbox

Warm-up network of only 1,000 email accounts

Warmy might be a good choice to warm up your email if you're a bulk email sender.

On Warmy’s platinum plan, you can send 5,000 daily warm-up emails.

Additionally, Warmy is one of the few warm-up tools that can send warm-up emails in foreign languages (not just in English).

✅ Pros

❌ Cons

Advanced warm-up features

Advanced warm-up features only available on higher-priced plans

Choose between 5 different plans

Initial setup can take some time

7-day free trial

Expensive

Inboxally is an expensive warm-up tool with some interesting features.

Apart from the usual warm-up features (opens, replies, emails in spam moves to inbox), Inboxally also scrolls down on the warm-up emails and clicks on any links.

These types of engagement help build trust with email service providers.

✅ Pros

❌ Cons

Advanced engagement action on warm-up emails

Expensive

10-day free trial

Generic warm-up emails

Allegrow is an inbox placement and email deliverability tool that lives directly in your email sender tool.

It integrates with Google Workspace, Office 365, Salesloft, Outreach, and Close.

The limited amount of tools Allegrow works with means that if you don’t use any of these tools, you won’t be able to use Allegrow.

✅ Pros

❌ Cons

Works straight from within your email service provider account

No transparent pricing

Catch spam before you send it

Can only be used with 5 email service providers

Spam score gamified - who in your company has the best spam rate?

Mailivery is one of the few warm-up tools that allows for unlimited inboxes.

However, the amount of daily warm-up emails is limited.

Mailivery’s cheapest plan, for example, allows for 100 warm-up emails per day.

✅ Pros

❌ Cons

Free plan available

Free plan limited to 10 daily emails

Unlimited inboxes

No technical setup check

Warm up your templates

Generic warm-up network

With this warm-up tool, you can set a custom warm-up schedule.

That means you decide how many daily warm-up emails you send out.

✅ Pros

❌ Cons

Free 7-day trial

Limited warm-up features

Opens your email several times just like a real human would

Fake testimonials on their site

Unlimited warm-up inboxes

Limited amount of warm-up emails per inbox

Warm Up Your Email is a warm-up service that most closely resembles manual warm-up.

In other words, real people engage with the warm-up emails.

Or, at least, that’s what WUYE claims. What makes us doubt this claim is that replies aren’t received in the same conversation thread, which is what would happen if you manually reply to an email.

✅ Pros

❌ Cons

Easy to set up

Limited amount of daily warm-up emails

Claims human interaction with warm-up emails

Replies not received in same thread

Affordable pricing

Has an abandoned feel to it

Email warm-up involves gradually increasing the sending volume and frequency for a new sending domain or IP address.

If you’re going to use youremail@yourdomain.com to send out outreach emails, you need to warm it up first so to slowly establish the sender reputation for your domain.

Internet service providers will see you as a spammer if you start sending hundreds of daily emails out of the blue.

And when what happens… well, say hello to the spam folder and goodbye to your ROI.

Just gradually increasing sending volume and frequency alone isn’t enough. Any spammer could do that.

The trick is also to get email engagement, which means opens, replies, clicks, or getting your emails marked as starred or important.

A good warm-up tool does all of the above for you.

The warm-up process typically takes about three weeks. However, this may vary depending on your domain's reputation.

Even after the warm-up process has been completed it's recommended to keep the warm-up service on to maintain a strong sender reputation.

Yes, you can. However, expect many of your emails to land in the spam folder.

The increase in daily warm-up emails should be gradual.

A good starting point is 5 daily emails and increase it by one or two daily until you are at a healthy number.

Typically, each warm-up tool has its own warm-up schedule, but some let you decide how fast you want to warm up your email.

You could technically warm-up your email manually, but it’s a heck of a job and you must continue warming it up even after starting outreach to maintain a positive sender reputation.

You could probably spend all that time on important strategic tasks instead of tediously warming up your email.

The cost of doing it yourself is much higher than paying a small monthly fee for one of these warm-up services.