Mailwarm ◆
Mailwarm automatically warms up email sender reputation to keep cold campaigns out of spam and into inboxes.
Free·Free trial · from $29/mo
About Warmbox.ai
What is Warmbox.ai?
Warmbox.ai is an email warm-up tool that prevents cold emails from landing in spam. By simulating natural email activity—sending, opening, replying, and removing from spam—it builds sender reputation with providers like Gmail, Outlook, Yahoo, and custom SMTP. The result: higher inbox placement rates for outreach campaigns.
Who is it for?
It is ideal for sales teams, marketers, and founders sending cold emails at scale who struggle with deliverability. It is less suited for casual personal email senders with low volume needs.
Real use cases
Sales teams use Warmbox.ai to warm up new domains before outreach. Marketers integrate it with tools like Mailchimp and HubSpot to maintain reputation during campaigns. Founders rely on its private inboxes network of +35,000 accounts to accelerate warming across multiple email providers.
Key features
- Automated Warm-Up — Sends and replies to emails from your address to build reputation
- Multi-Provider Support — Works with Gmail, Outlook, Yahoo, iCloud, Amazon SES, SMTP, and more
- Realistic AI Interactions — Uses GPT-4 to generate human-like emails, replies, and spam removal
- Deliverability Monitoring — Dashboard shows inbox placement rate, spam score, and bounce rate
- Customizable Schedules — Set daily send limits and choose growth, flat, or random warm-up patterns
- Private Inboxes Network — Access to +35,000 inboxes to boost reputation safely
- Live Email Checker — DNS and blacklist monitoring for your domain
SaaSpartout Score
7.1
/10
Editorial score from our review methodology — not user ratings.
Warmbox.ai Pricing
Warmbox.ai pricing: from $15/mo. Billing model: Freemium.
Solo - $15/month (yearly) / $19/month (monthly)
1 inbox warm-up, 50 emails/day, 1 team member, premium support.
Start-up - $69/month (yearly) / $79/month (monthly)
3 inbox warm-up, 250 emails/day, 3 team members, premium support.
Growth - $139/month (yearly) / $159/month (monthly)
6 inbox warm-up, 500 emails/day, 6 team members, enterprise support.
Team - Custom plans
For agencies and enterprises with higher sending volumes. Contact via chat for pricing.
All plans include a free trial (no credit card required). Features like GPT-4 interactions, private inboxes network, and live email checker are included across all tiers.
Exclusive deal via SaaSpartout
Get the deal →Frequently asked questions
How much does Warmbox.ai cost?
Pricing starts at $15/month (yearly billing) for Solo plan with 1 inbox and 50 emails/day. Monthly plans start at $19/month.
Is Warmbox.ai free to try?
Yes, Warmbox.ai offers a free trial. No credit card is required to start warming your inbox.
How does Warmbox.ai work?
It connects your email account, then sends and receives natural-looking emails using GPT-4 to build sender reputation with mailbox providers, improving deliverability for cold outreach.
Who is Warmbox.ai best for?
It is best for sales teams, marketers, and founders who send cold emails at scale and need to avoid spam folders. It is less suited for low-volume personal email users.
What are the top alternatives to Warmbox.ai?
Popular alternatives include Mailwarm, Lemwarm, and WarmupInbox, which offer similar email warm-up features for different budgets.
Does Warmbox.ai support Gmail and Outlook?
Yes, it supports Gmail, Outlook, Yahoo, iCloud, and custom SMTP providers like Amazon SES, SendGrid, and Mailgun.
