Warmup Inbox

Warmup Inbox lets you avoid the spam folder with unparalleled email warmups so that you can reach more leads and customers.

Avoid spam folders and avoid getting blacklisted. You can also monitor and improve your sender reputation, keep your emails out of promotional folders as well, receive alerts when things go wrong, and align your email content with your ICP.

Trusted by sales and marketing teams large and small, Warmup Inbox works by connecting your email account to a network of 30,000 plus real, continuously changing inboxes that interact with your emails naturally, replying to them, marking them as important, and moving them out of spam.

These positive signals train email service providers to treat your account as legitimate, gradually building the sender reputation you need to land in the inbox consistently.

If you are building a complete system, it fits inside a broader outbound stack that includes inbox infrastructure like Mailforge and sending platforms such as Instantly or Smartlead.

What makes Warmup Inbox stand out from other warmup tools is the depth of its feature set at an affordable price point.

Beyond standard warmup, it offers language specific warmup for multilingual campaigns across 12 languages, ESP specific warmup to target Google Workspace or Outlook users directly, a built in cold email sequencer with contact list verification, spam monitoring, blacklist alerts, and a free email spam checker tool.

Users report seeing measurable improvements in email reputation within as little as one week of using the platform, with some reporting open rate increases of over 30 percent within two months.

Top Warmup Inbox Features

• Network of 30,000 plus real active inboxes for warmup
• Automated email interactions including replies, important tags, and spam removal
• Sender reputation monitoring and scoring
• Spam folder and category monitoring
• Blacklist monitoring with instant alerts
• Free email spam checker tool
• Language warmup across 12 languages including English, French, German, Spanish, and more
• ESP specific warmup targeting Google Workspace and Outlook
• Cold email sequence builder with automation
• Contact list verification via EmailListVerify integration
• Custom variables for email personalization
• Human like AI generated warmup content audited by staff
• Custom warmup settings and topic selection on Pro and Max plans
• Scheduled warmup on Pro and Max plans
• Technical setup check on Max plan
• Developers API access
• Compatible with Gmail, Outlook, Zoho, SendGrid, and any SMTP inbox
• 7 day free trial with no credit card required

Warmup Inbox Pricing

Warmup Inbox pricing starts at $15 per inbox per month on the Basic plan billed yearly, making it one of the most affordable options listed in the full Cold Email Tools Directory.

The Basic plan includes 75 warmup messages per day, replies of up to 25 percent, access to 30,000 plus real inboxes, spam and category monitoring, email reputation checks, outreach sequences, dashboards, human like AI generated content, developer API, and customer support.

The Pro plan is $49 per inbox per month billed yearly and increases warmup messages to 250 per day with replies up to 45 percent. It also adds language warmup, ESP warmup, custom templates, custom warmup settings, scheduled warmup, and priority customer support.

The Max plan is $79 per inbox per month billed yearly and includes up to 1,000 warmup messages per day, replies up to 50 percent, premium customer support, technical setup checks, unlimited developer API, and early access to new features.

Half yearly billing saves 10 percent and yearly billing saves 20 percent across all plans.

Frequently Asked Questions About Warmup Inbox

1. What is Warmup Inbox and how does it work?

Warmup Inbox is an email warmup tool that builds your sender reputation by connecting your inbox to a network of 30,000 plus real inboxes that interact with your emails naturally. These interactions include opening your emails, replying to them, marking them as important, and removing them from spam. This activity signals to email providers that your account is trustworthy, gradually improving your inbox placement rate and keeping your emails out of spam folders.

2. How long does it take to warm up an email account with Warmup Inbox?

Most users see measurable improvement in their email reputation within the first week of using Warmup Inbox. For new accounts, a full warmup period of 45 to 90 days is recommended. For teams running ongoing cold outreach, Warmup Inbox recommends keeping warmup running for as long as you are actively sending campaigns to maintain your sender reputation over time.

3. Can I send cold emails while my inbox is warming up?

Yes. You can run cold email campaigns while your inbox is warming up. Warmup Inbox even includes a built in cold email sequence tool that lets you automate, personalize, and manage your outreach campaigns directly inside the platform. All plans allow up to 50 cold outreach emails per day alongside your warmup activity.

4. Which email providers does Warmup Inbox support?

Warmup Inbox supports Gmail, Outlook, Zoho, SendGrid, and any other inbox that uses SMTP. This makes it compatible with virtually every major email service provider used for cold outreach and business email communication.

5. What is language warmup and who is it for?

Language warmup is a feature available on the Pro plan that warms up your emails in the specific language of your target audience. It supports 12 languages including English, French, German, Spanish, Italian, Portuguese, Polish, Dutch, Danish, Finnish, Slovak, and Russian. This is particularly useful for teams running multilingual campaigns in different regions, as it builds region specific sender trust with email providers and improves deliverability and open rates in those markets.

6. What is ESP warmup and why does it matter?

ESP warmup is a feature that focuses your warmup activity on specific email service providers such as Google Workspace or Outlook rather than spreading warmup evenly across all providers. If your prospect base is predominantly Gmail or Outlook users, concentrating your warmup on those providers directly improves your chances of landing in their primary inbox. Warmup Inbox recommends setting up two dedicated cold email domains, one on Google Workspace and one on Outlook, and using ESP warmup to build trust with each provider separately.

7. How does Warmup Inbox pricing compare to other warmup tools?

Warmup Inbox starts at just $15 per inbox per month, making it one of the most affordable email warmup tools available. Users consistently highlight the price to value ratio in reviews. Despite the low entry price, the Basic plan still includes spam monitoring, reputation checks, a real inbox network of 30,000 plus accounts, outreach sequences, and developer API access, features that many competitors charge significantly more for.