Warmup Inbox Review

Is this the best email warmup toolA service that helps senders build, improve, or maintain their email domain reputation and improve email deliverability by sending real email messages that deliver positive engagement, such as opens, clicks, and favorites. for you?

Check out this detailed review of Warmup Inbox pros and cons, pricing, customer feedback, and more to find out if it’s the right tool to help get your emails out of spam.

A woman in glasses sits at a desk with her hands crossed under chin and looks at her laptop.

Are your emails reaching your prospects’ and customers’ inboxes – or are they landing right in the spam folder?

The truth is that this is precisely what’s happening to a percentage of your company emails. And they’re usually not being sent by the marketing team. Sales professionals, business development representatives, and other outreach specialists also play a role in helping internet service providers assess the quality of your emails.

Email warmup tools continue to grow in popularity thanks to their ability to build and reverse damage to a company’s sender reputation through automated, positive engagement signals. Adding one to your email outreach and marketing stack can vastly improve your business’s inbox visibility and the overall performance of your email campaigns.

This Warmup Inbox review will serve as a guide to help you understand the popular email warmup tool's features, pricing, benefits, and more. We’ll also include testimonials and feedback from real customers to give you an honest look at their platform.

What is Warmup Inbox?

Warmup Inbox is a dedicated email warmup tool designed to help businesses improve their email deliverabilityA sender’s ability to reach the recipient’s inbox with their outgoing emails. It may also describe the ratio of emails delivered to the inbox vs. those sent to spam or blocked by the receiving server. and sender reputation.

Founded by Mike Benson (currently of Mailstand), Warmup Inbox is part of Itrinity’s SaaS tool portfolio. Its email warmup tool is meant for salespeople, marketers, lead gen experts, recruiters, and anyone who uses email for business outreach.

By syncing your mail domain, Warmup Inbox allows your mailbox to communicate with a network of inboxes that mark your emails as important and “not spam,” along with other positive engagement signals. These activities train ISPs to view your company emails as safe and trustworthy.

Warmup Inbox features

Warmup Inbox focuses solely on providing a high-quality email warmup service. However, it does offer several free tools that are helpful for securing emails, improving email deliverability, and keeping campaigns out of spam.

The following list of features will focus specifically on Warmup Inbox’s email warmup tool features and capabilities.

ZeroBounce Image Email warmup for any inbox via SMTP connection

Warmup Inbox currently supports connection with all major email providers, including Gmail/G-Suite, Outlook, Yahoo!, Salesforce, AWS, AOL, and more. You can effectively sync any mailbox provider that supports an SMTP connection.

ZeroBounce Image Engagement via a network of real inboxes

After syncing your business email domain, you’ll be added to Warmup Inbox’s network of 30,000+ inboxes, which are made up of other connected customers.

However, Warmup Inbox states that it maintains your business privacy through controlled warmup interactions and limited access to your account emails. All emails used by the email warmup tool are explicitly created for the process and do not interfere with your regular business emails.

ZeroBounce Image Automated email engagement

Warmup Inbox’s email warmup process is fully automated. This means that Warmup Inbox creates all email content used for the process without any additional input from you.

Those warmup emails are then sent to other inboxes within the network, which then automatically respond to your emails as needed. For example, if your email lands in the spam folder, it will be marked as “not spam” and “important” to send a positive signal to the service provider.

Whenever providers receive a high enough volume of these positive signals, they become trained to view your business domain and your emails as safe and trustworthy.

ZeroBounce Image DNS, email authenticationOne or more techniques or policies created to help internet service providers determine the identity of an email sender as legitimate. Examples of email authentication include SPF, DKIM, DMARC, and BIMI., and reputation insights

Warmup Inbox constantly assesses your current email domain and sender reputation. As a result, it can also analyze other factors that directly impact your email deliverability, including things like your DNS settings, authentication records, and more. It will also monitor your domain to check if it’s listed on known email blacklists.

ZeroBounce Image Email warmup performance reporting

Warmup Inbox provides a detailed analysis of your email warmup performance. It tracks the percentage of emails that end up in the spam folder, revealing your reputation improvements over time as more emails begin to land in the inbox naturally.

Your reporting includes important details regarding where emails land and provides alerts when your email deliverability score drops below a set point.

ZeroBounce Image Who is the ideal user of Warmup Inbox?

Warmup Inbox specifically addresses salespeople, marketers, lead gen experts, and recruiters on its platform. However, email warmup tools can benefit any business that sends mass emails or struggles with email deliverability.

Examples of use cases include:

  • Cold email and sales outreach
  • Recruitment emails
  • Email marketing campaigns
  • Customer retention
  • Business development outreach

If your business uses email for any of these purposes or is considering implementing these strategies, Warmup Inbox may benefit your email visibility and engagement.

ZeroBounce Image Warmup Inbox pricing

The selected plan determines Warmup Inbox pricing. The platform currently offers three tiers: Basic, Pro, and Max, each with a progressively larger message volume and additional features proportional to the price increase.

Here’s a breakdown of Warmup Inbox pricing and the features included with each plan:

Recommended for 1,000 monthly emails or less
Basic
$19
per month per inbox
75 Messages per day

Features
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Uses 30k+ inboxes
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Replies to your warm-up emails up to 25%
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Category monitoring
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Email reputation check
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Add your own templates
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API
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Customer support chat
Recommended for 2,000-5,000 monthly emails
Pro
$58
per month per inbox
250 Messages per day

Features
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Customizable warmup settings
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Replies up to 45%
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Statistics for custom templates
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Warmup targeting specific providers
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Scheduling
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Language options
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Priority support
Recommended for 5,000+ monthly emails
Max
$99
per month per inbox
1000 Messages per day

Features
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Replies up to 65%
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Technical setup help
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Unlimited API
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Premium support

In addition to these price points, Warmup Inbox also offers a 20% annual subscription discount.

ZeroBounce Image Warmup Inbox customer feedback

Customers on Trustpilot offer similar reviews of Warmup Inbox, citing ease of use, improved reputation, and dependable customer support.

ZeroBounce Image Warmup Inbox integrations

Warmup Inbox works reliably with any email provider that supports an SMTP connection. However, they do list the following platforms as having direct integrations:

  • Google Workspace
  • Microsoft Outlook
  • Zoho
  • Amazon SES
  • Mailgun
  • Sendgrid
  • Sendinblue

ZeroBounce Image Warmup Inbox security & compliance features

Warmup Inbox does not explicitly define the security features or protocols it uses to protect your business data. However, its Privacy Policy does disclose adherence to required data collection and privacy regulations such as CCPA and GDPR.

Regarding the warmup process, Warmup Inbox mentions having limited access to your mail accounts, as they cite the ability only to access warmup-related emails.

Want a direct comparison of ZeroBounce and Warmup Inbox?

ZeroBounce Image Warmup Inbox alternatives

For more of the best email warmup tool reviews, let’s examine some competitors in the space.

ZeroBounce Image ZeroBounce

ZeroBounce offers email senders a comparable email warmup tool, aptly called Warmup, to help improve email deliverability. Here’s what you get with the platform’s email warmup plans:

Customers can also contact the ZeroBounce team to build a customized plan that fits their company’s unique email needs.

Other notable features of ZeroBounce’s Warmup service include the following:

ZeroBounce Image Email warm-up for any mailbox that supports SMTP connections

ZeroBounce Image Warm-up is performed with privately owned seed email addresses; your warm-up emails are never sent to other customer inboxes

ZeroBounce Image Category monitoring to track which emails go to the inbox vs. spam

ZeroBounce Image Wholly automated with the ZeroBounce-managed method or more advanced settings and control with the user-managed method

ZeroBounce Image Seamless sync up with other toolkit tools like DMARC and Blacklist Monitor for additional reputation tracking

ZeroBounce Image Dedicated email warm-up dashboard to track inbox score and email deliverability improvements over time

Check out the toolkits

ZeroBounce Image Warmy.io

Warmy.io is also a premier email warm-up service with a strong customer reputation. The platform is dedicated almost entirely to email warm-up and offers several plan tiers based on your current email-sending volume.

Starter$49month per mailboxRecommended for 1k emails/mo.
Business$129month per mailboxRecommended for 5k emails/mo.
Premium$189month per mailboxRecommended for 10k emails/mo
Check out our Warmy.io review

Try ZeroBounce for email warm-up

Popularized by its industry-leading email validationA process that determines if an email address uses valid syntax, exists on a given domain, and is configured to receive incoming email messages tool, ZeroBounce offers a complete package of tools to help 400,000+ businesses worldwide achieve optimal email deliverability.

Give the platform a try today – create a free account now to get started.

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ZeroBounce is a Leader in the Email Verification category with G2 for the Winter of 2025.
ZeroBounce is a Small Business Leader in the Email Verification category with G2 for the Winter of 2025.
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ZeroBounce is a High Performer in the Email Verification category with G2 for the Winter of 2025.
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ZeroBounce earns a G2 Users Love Us badge in the Email Verification category with G2 for the Winter of 2025.

Conclusion: Warmup Inbox pros and cons

Warmup Inbox is a strong email warm-up service loved by many users. It offers a strong value proposition for businesses that only need to warm up a small number of domains. Here’s a quick rundown of the pros and cons we found, along with some highlights mentioned by real users on G2 and Trustpilot.

Pros

  • Quality customer service
  • Ease of use
  • Ability to add your own templates
  • Category monitoring & reputation checks
  • API
  • Connects to any mailbox via SMTP

Cons

  • Per mailbox pricing may add up for businesses requiring warm-up for multiple inboxes
  • Dedicated support gated behind higher-tier plans
  • Unlimited API usage is reserved for the Max plan
  • Advanced features locked behind higher plans

Frequently asked questions

Warmup Inbox is an email warm-up tool that helps businesses, email senders, and outreach specialists improve their email deliverability through automated positive engagement signals. Warmup Inbox sends unique warm-up emails from your domain to other inboxes, marks them as important, and gradually improves your reputation with ISPs over time.

Warmup Inbox improves email deliverability, sender reputation, and inbox visibility for business emails. The platform automatically marks outbound emails as “not spam” and important, sending a positive signal to internet service providers. When ISPs accumulate enough positive signals, they are trained to trust your domain and cease to place your emails in spam.

Warmup Inbox has a mostly positive reputation with customers on open review platforms such as G2 and Trustpilot, with a score of 4.7 out of 5 stars. Most users cite positive experiences with the platform, ease of use, and quality customer support.

For high-quality alternatives to Warmup Inbox, the following email warm-up tools are also available: ZeroBounce’s Warmup, Warmy.io, or Lemwarm.

Email warm-up tools are one of the most effective tools for quickly and gradually improving your email sender reputation. Internet service providers use sender reputation to determine the trustworthiness of a domain based on metrics like bounce rates and spam complaints. The email warm-up tool ensures that these metrics improve by marking all of your warm-up emails as “not spam” and important, repeatedly sending positive signals to train the ISP to trust your domain.