12 Best Email Warm-Up Tools in 2024 - Features, Pros & Cons

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 warm-up and deliverability tools that can help improve your open rates:

Email Warm-Up Tools Compared

lemwarm

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.

Standout features

• Deliverability and sender reputation monitoring
• Warm-up network of inboxes tailored to your niche
• Warm up your real email templates
• Alerts when deliverability issues occur
• Manage your entire team’s deliverability in one place

Pricing

• Essential plan - $29/month
• Smart plan - $49/month
• Free with lemlist Pro plan

Pros and Cons

Folderly

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.

Standout features

• Inbox Insights checks your email placement, IPs, and DNS records before launching campaigns (separate product)
• Single-click mailbox connection
• Email content analysis and recommendations

Pricing

• Folderly
  • 1-9 mailboxes - $96/month per mailbox
  • 10-24 mailboxes - $72/month per mailbox
  • 25-99 mailboxes - $56/month per mailbox
  • 100+ mailboxes - Custom pricing
• Inbox insights
  • Free - 2 tests per month
  • $79/month when paid monthly
  • $64/month when paid yearly

Pros and Cons

Warmbox

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.

Standout features

• AI-generated warm-up emails (GPT-4)
• Spam score monitoring
• Customizable warm-up options based on criteria like your target audience, email volume, and sender reputation

Pricing

• Solo plan - $19/month - 1 inbox to warm up
• Start-up plan - $79/month - 3 inboxes to warm up
• Growth plan - $159/month - 6 inboxes to warm up

Pros and Cons

Mailreach

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.

Standout features

• Smart warming algorithm
• Network of 20,000 real human inboxes for warm-up purposes
• Email reputation monitoring

Pricing

• Starter - $25/month per email account
• Scale - $19.5/month per email account

Pros and Cons

Warmup Inbox

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.

Standout features

• 30,000+ real inboxes for email warm-up
• Warm up your templates
• 7-day free trial

Pricing

• Basic - $19/month per mailbox
• Pro - $59/month per mailbox
• Max - $99/month per mailbox

Pros and Cons

Mailwarm

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

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

Standout features

• Engagement for warm-up emails like opens, replies and emails getting marked as starred.
• Blacklist monitoring

Pricing

• Starter - $79/month - 1 inbox - 50 daily warm-up emails
• Growth - $189/month - 3 inboxes - 200 daily warm-up emails
• Scale - $549/month - 10 inboxes - 500 daily warm-up emails

Pros and Cons

Warmy

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).

Standout features

• Warm-up your templates
• Choose warm-up topic and language
• Different warm-up speeds

Pricing

• Starter - $49/month per mailbox
• Business - $129/month per mailbox
• Premium - $189/month per mailbox
• Expert - $279/month per mailbox
• Platinum - $429/month per mailbox

Pros and Cons

Inboxally

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.

Standout features

• Scrolling action on longer warm-up emails
• Clicks on links if warm-up emails contain any
• Chat support

Pricing

• Starter $149/month - 1 sender profile
• Plus $645/month - 5 sender profiles
• Premium $1,190/month - 10 sender profiles
• Enterprise - custom pricing

Pros and Cons

Allegrow

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.

Standout features

• Email service provider integration
• Safety Net features catches emails with spammy content before you send them
• Deliverability Leaderboard: Which senders in your company have the highest and lowest spam rate

Pricing

• Premium - for teams of up to 10 people - no transparent pricing
• Scale plus - for teams of more than 25 people - no transparent pricing

Pros and Cons

Mailivery

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.

Standout features

• Unlimited inboxes
• Manage your team’s activity straight from the dashboard
• Custom warm-up templates

Pricing

• Starters - $29/month - 100 warm-up emails per day
• Professional - $79/month - 600 warm-up emails per day
• Business - $199/month - 2000 warm-up emails per day

Pros and Cons

TrulyInbox

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.

Standout Features

• Custom warm-up schedule
• Multiple opens on the same warm-up email
• Customizable reply rate for warm-up emails

Pricing

• Starter - $39/month - 5 active email accounts
• Growth - $99/month - 20 active email accounts
• Scale - $199/month - 50 active email accounts
• Business - $299/month - 75 email accounts

Pros and Cons

Warm Up Your Email by Mailshake

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.

Standout features

• Real humans engage with your warm-up emails?
• You control the reply rate (30% is recommended)
• 24/7 support

Pricing

• Sole sender - $29/month - 1 inbox - 50 positive engagements/day
• Pro sender - $49/month - 3 inboxes - 50 positive engagements/day per inbox
• Agency sender - $99/month - 8 inboxes -  100 positive engagements/day per inbox

Pros and Cons

Email Warm-Up FAQ

What is Email Warm-Up?

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.

How long does it take to warm up an email?

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.

Can I start my campaign without warming up my email?

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

What are the recommended sending volume and frequency during email warmup?

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.

Can I warm up my email manually?

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.