3x your email response rate! – Only $15 Per Inbox!

Keep your marketing emails out of spam folders

Whether you’re using email to promote your product, get more leads or do link building outreach, you won’t get far if a big number of your emails ends up in spam.
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Case Study

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  • Our Customer

    Mangools is a powerful SEO toolkit that helps you build your online presence with 5 distinct services designed to help both small and large businesses.
    “Most marketers begin email campaigns by focusing on messaging or offers. But this experience taught me the first step should be setting clear goals—followed by a 2–4 week warmup before launching.”

  • Costly Mistake: An Unwarmed IP During a Critical Campaign

    Mangools had a huge challenge during their 2022 Black Friday campaign. With over 3 million emails to send out in a limited timeframe, they hit a major roadblock – their IP wasn’t adequately warmed up, causing half of the emails to end up in the spam folder instead of their customers’ inboxes. The result? A major decrease in the campaign’s success rate, which was a tough pill for the company to swallow. But they didn’t let this setback defeat them. In fact, they took this as a valuable lesson and decided to take a more proactive approach to IP warmup before launching future email campaigns.

  • Properly Warmed Up IPs

    The team at Mangools realized that if they wanted to keep their emails from being flagged as spam and reaching their prospects’ inboxes, they needed a better solution. With Warmup Inbox, they created three new dedicated IPs and two shared IPs with new subdomains and started the warmup process. The open rates of their emails jumped from a low 1% to an impressive 32%, while the click rates also skyrocketed from 0.16% to a remarkable 7.55%. The spam rates, a major concern for Mangools, dropped from an alarmingly high 63% to a much more manageable 19%!

Features

Whether you’re using email to promote your product, get more leads or do link building outreach, you won’t get far if a big number of your emails ends up in spam.

Cold Email Sequence

Automate, personalize, and manage your cold outreach campaigns.rnrn

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Language Warmup

Increase your email deliverability and engagement by connecting with your prospects in their language.

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ESP Warmup Tool

Start landing in the inbox instead of the spam folder.rnrn

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Email Warmup

Increase your email deliverability with specific providers.

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Pricing

Get the right plan for your team and scale your email outreach effortlessly.

Warmup Inbox Blog

Welcome to the Warmup Inbox Blog, your go-to resource for mastering cold emailing, email marketing, and email warmup strategies.
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Frequently Asked Questions

  • Email warmup is a process of preparing a new (or long-inactive) email account for future email outreach, campaigns, etc. It is especially useful for cold email inboxes that usually suffer from lower deliverability rates due to the character of the emails they send.
  • Connect your email account to the Warmup Inbox network. Our system automatically sends and receives emails on your behalf, gradually increasing the volume and engagement (opens, replies, “mark as important”) to prove to providers that you are a trustworthy sender.
  • Yes, but proceed with caution. We recommend keeping your campaign volume low (e.g., under 20-50 emails per day) during the first few weeks. Let the warmup tool handle the majority of the traffic to establish a solid reputation baseline before you scale up.
  • We support all major email service providers, including Google Workspace (Gmail), Microsoft 365 (Outlook/Exchange), Yahoo, and Zoho. Additionally, we support any custom email provider that allows connection via SMTP/IMAP.
  • Email warmup is the process of gradually building trust with email providers. By slowly increasing your daily sending volume and generating automated positive engagement (opens and replies), you prove you aren’t a spammer, ensuring your real campaigns land in the primary inbox instead of the spam folder.
  • A pre-warmed email address has a consistent sending history and steady engagement. It shows natural activity patterns, real replies, and stable deliverability metrics.

    Inbox providers see it as a trusted sender rather than a sudden spike of cold outreach. That trust increases the chances of your emails landing in the primary inbox instead of spam.
  • If you’re only sending a few emails to people you know, no. But if you are sending hundreds of cold emails for lead generation, yes. Warmup prevents providers (like Google) from flagging your sudden volume spikes as spam by simulating natural, human-like sending behavior first.
  • 14 to 21 days is the minimum. Spam filters actively look for a “slow ramp” in activity. If a new inbox blasts hundreds of emails on day one, it gets blacklisted instantly. Rushing the process almost guarantees your domain will be burned.
  • Yes, by building a positive sender reputation. Our network automatically opens, replies to, and rescues your emails from spam folders, training algorithms to trust your domain. However, to stay in the inbox, you still need to send good, personalized email copy.