You may recall seeing the name Warmforge somewhere, and it’s not far from the truth. Warmforge is part of the “Forge” family of products that includes Salesforge and Mailforge. Warmforge is built to enhance email deliverability by giving you an email infrastructure. It helps you maximize sales pipeline coverage by warming up your inboxes before outreach.
Today, we take a look at Warmforge as a tool that helps with email warm up and find out if it’s worth the cost. And of course, we give you some other options that can help you improve your email performance.
What is Warmforge and who is it for? 
Warmforge is an AI‑powered email warm‑up platform built to improve email deliverability, particularly to help emails land in the primary inbox instead of the spam folder.
Warmforge automates the process of warming up your email account by sending AI‑generated, human‑like interactions within your mailbox. It mimics realistic behaviors, such as opening, replying, and removing messages from spam, to build sender reputation over time.
The platform tracks a “heat score” (up to 100) that indicates the level of trust associated with your mailbox. It also includes tools to monitor health metrics (such as DNS and MX records and blacklist status) and offers monthly deliverability (placement) tests to show how well your emails perform across major providers.
Warmforge is best suited for users and organizations that send cold outreach, marketing emails, or high‑volume communications and want higher inbox placement:
- Sales teams and agencies doing cold emailing
- Marketing departments running campaigns
- SaaS operations and small businesses with outreach needs
- Any organization needing better email reputation across Gmail, Outlook, etc.
It is helpful for people at companies of various sizes, from startups and small businesses to agencies and larger firms, especially when managing multiple mailboxes or domains
Top Warmforge features
Warmforge comes with a rich feature set to manage and warm up multiple mailboxes simultaneously. Here are the key features of this tool.
- AI‑powered email warm‑up
Warmforge simulates authentic human-like exchanges within your mailbox: sending, opening, and replying to emails. The goal is to establish trust with email service providers like Gmail and Outlook. These interactions are generated by AI to mirror real correspondence rather than repetitive automated blasts.
- Heat Score System
You’ll see a real-time “heat score” metric for each mailbox, showing how ready it is for outreach. The platform recommends reaching 85–100 before sending campaigns, taking uncertainty out of launch timing.
- Continuous Health Checks
Warmforge automatically monitors critical technical settings like DNS, MX records, and blacklist status. If any issue arises, it alerts you early to avoid deliverability crises.
- Inbox Placement Tests
Every plan includes at least one placement test per month. This sends test emails to different providers and reports where they land, revealing misplacement or filtering issues before real campaigns begin.
- Spam Recovery Automation
The system automatically detects messages that land in spam and removes them from your mailbox. This behavior signals trust to email providers and improves future placement rates.
- Always‑On Warm‑Up
Once activated, your mailbox stays warmed up continuously. This consistent activity prevents sudden drops in reputation if outreach goes quiet, keeping deliverability stable over time.
- Multi‑Mailbox and Domain Support
Manage and warm multiple email accounts and domains from a single dashboard. Useful for agencies, SaaS teams, or anyone handling outreach across clients or several inboxes.
8. Dashboard with Deliverability Metrics
Access a centralized dashboard that tracks metrics like inbox placement, reply rates, bounce rates, and spam rescues. These insights empower data-driven decisions
Warmforge email warm up pricing
Warmforge has three pricing plans, and it takes a bit of research to find out which one works best for your email campaigns.
Warmforge pricing works with a slot‑based system, where each slot covers one mailbox:
- $12 per mailbox per month, billed on a monthly plan. This is the base rate for single or small-quantity users
- $10 per mailbox per month, when billed quarterly (10 % discount)
- Annual billing includes two months free, lowering the effective monthly cost further
Volume discounts make pricing highly scalable:
- Costs can fall as low as $3 per mailbox per month for large teams or agencies managing many accounts
Every paid slot includes valuable features, so you don’t need add‑ons:
- AI‑powered email warm‑up automation
- Heat score tracking to assess readiness for outreach
- Health checks monitoring DNS, MX, and blacklist status
- One free placement test per mailbox per monthis included in the base price
Placement test plans (optional add‑ons) offer deeper deliverability visibility:
- Pro Plan: up to 100 tests/month across 50 mailboxes, around $39/month (or $32.50/month annual)
- Growth Plan: unlimited tests for up to 250 mailboxes, about $169/month (or $140.80/month annual)
Other useful details:
- There is no contract required, and you can cancel anytime
- If you’re using Salesforge already, Warmforge comes included with unlimited mailbox slots at no extra cost
What Warmforge users are saying
One of the common complaints about Warmforge is the pricing. At $12 per inbox, it can get very expensive very fast for bulk users.
“The pricing seems a bit steep, starting at $12 per mailbox. For anyone managing a larger volume, this could get expensive fast. If there were volume discounts or bundling options with other tools, it would be more compelling. At this stage, I’m also still waiting to see a measurable impact from the warm-up process.” – Source
The second issue is that Warmforge was at some point separated from the main product called Mailforge, which is used to send cold email campaigns from scratch.
“Actually, I don’t know why they moved warming-up to the dedicated product. But as all *Forge tools are integrated, it is not a problem at all.” – Source
Also, setting up some of the more technical aspects of the cold email infrastructure can be advanced for novice users.
“The setup for DNS records can be tricky if you’re not tech-savvy, and the support response time is sometimes slow, but rarely.” – Source
Top Warmforge alternatives to improve your sender reputation in 2025
Looking to improve your mailbox reputation, but Warmforge hasn’t convinced you yet? Here are some of the best tools to help you achieve improved deliverability.
Woodpecker
Woodpecker is a cold outreach platform designed for sales teams, agencies, or founders who want an all-in-one solution combining campaign sequencing, built-in email warm-up, deliverability safeguards, and team collaboration.
Top features
- Free email warm-up & verification: Automates domain warming and validates emails to reduce bounces and protect sender reputation.
- Deliverability toolkit: Includes inbox rotation, adaptive sending, bounce shielding, spam‑word detection, and SPF/DKIM domain auditing to help you stay out of the spam folder.
- Sequence automation & A/B testing: Build multi-step campaigns with conditional logic, timezone scheduling, and split testing (up to five variations).
- Unlimited accounts & team collaboration: Add email accounts and team members at no additional cost.
- Integrations & add-ons: API/webhooks and built-in integrations with HubSpot, Pipedrive, Zapier, and more; optional add-ons include LinkedIn automation, agency panel, extra warm-up slots, and domains.
Pricing (monthly billing)
Note: Annual billing gives you up to ~33% savings.
Considerations
- ❌ The analytics are less visual or flexible than some alternatives.
- ❌ AI-backed prospecting and built-in LinkedIn automation are limited without paid integrations.
User feedback
✅ “Deliverability features like warm-up and inbox rotation are strong.”
✅ “Simple and efficient for scaling cold outreach.”
❌ “Starter tier volume feels restrictive quickly once scaling begins.”
Why Woodpecker is an ideal alternative to Warmforge
Warmforge offers domain and server warm-up infrastructure in a more managed, technical way. Woodpecker, on the other hand, integrates warm-up, verification, and campaign automation. It eliminates the need for separate infrastructure setup while offering deliverability controls, campaign flexibility, and growth-driven scale.
Woodpecker is lighter to set up and more flexible in pricing, making it a smart choice for teams transitioning from Warmforge who still need strong inbox placement and campaign control.
Try Woodpecker for free today!
Mailreef
Mailreef is a cold email infrastructure platform focused on helping agencies and outreach-heavy teams set up and manage a large number of inboxes with high deliverability. It’s built for those who want full control over domains, mailboxes, and technical records without relying on third-party warmup-only tools.
Top features:
- Dedicated mail server with over 150 mailboxes per server
- Dedicated IP addresses to improve inbox placement
- Bring your own domain or purchase one-click domains directly inside Mailreef
- SPF, DKIM, and DMARC auto-configuration
- Server and mailbox health monitoring, live support, and built-in integrations with Smartlead and Instantly
- Developer-friendly API access
Pricing:
Mailreef offers three plans:
- Agency: $240/month (annual commitment required), plus $0.001 per email sent
- Agency Flex: $249/month (monthly billing), same email pricing
- Enterprise: Custom pricing based on needs
All plans include the same core features. The difference is in commitment, flexibility, and volume.
Considerations:
❌ No free trial or short-term test period
❌ Higher upfront cost than warmup-focused tools
❌ Lacks built-in warmup email simulation; designed for full cold email infrastructure setup
❌ No public reviews available as of now
Why Mailreef is a good Warmforge alternative:
Mailreef is a suitable replacement for users who want to handle cold outreach at scale with technical precision. Like Warmforge, it gives you full control over inbox volume, server setup, and domain infrastructure.
While Mailreef doesn’t offer some of the advanced warmup analytics or inbox monitoring that Warmforge includes, it’s ideal for agencies that already use tools like Smartlead and just need a reliable backend to power their sending.
Warmy
Warmy is an AI-powered email warm-up and deliverability tool that automates sender reputation building, mailbox health tests, and inbox placement analysis without technical setup. It’s ideal for solo operators, SDRs, or small teams primarily using Gmail or similar providers.
Top features
- Automated email warm-up: Sends and replies to seed-list messages to simulate natural interaction and grow sender reputation.
- Deliverability insights: Tracks placement status (inbox, spam, promotions), health scores, and domain reputation trends.
- Google Postmaster and domain monitoring: Integrates feedback to provide proactive deliverability guidance.
- Support for multiple providers: Works with Gmail, Outlook, Zoho, Amazon SES, and more.
Pricing
Per mailbox, monthly pricing tiers include:
- Starter – $49: 100 warm-up emails/day, 1 DNS/placement test
- Business – $129: 300 emails/day, 3 tests
- Premium – $189: 1,000 emails/day, 10 tests
- Expert – $279: 2,000 emails/day, 50 tests
- Platinum – $429: Highest volume, 100 DNS/placement tests
Starter and Business tiers often work best for beginning users.
Considerations
- ❌ Charges per mailbox mean costs scale quickly for teams managing many inboxes.
- ❌ Lacks DNS-level control (SPF/DKIM/DMARC setup), making it less ideal for higher-tier infrastructure needs.
- ❌ Dashboard analytics and API flexibility are limited in customization.
- ❌ Warm-up results on Outlook or custom SMTP domains may be inconsistent.
User reviews
✅ “Easy setup, emails reach inboxes consistently.”
✅ “Dashboard is beginner-friendly and support is responsive.”
❌ “Per-inbox pricing becomes expensive fast.”
❌ “Warm-up behavior is repetitive at scale.”
Why Warmy works as a Warmforge alternative
Warmy offers straightforward, calendar-free automation for warming up individual inboxes, making it perfect for solo users or teams pairing it with their existing sending stack. In contrast, Warmforge provides scaled warm-up infrastructure, DNS integration, real-time alerts, and multi-inbox capability in one platform.
Conclusion
Warmforge is a top choice if you’re already using Mailforge and you have money to spare. If you’re looking for more advanced features, more affordable pricing and something that will always help you land in the primary inbox, look elsewhere.
Why not give Woodpecker a try instead? We have all the tools to help you master cold email from scratch. Warm up, automated sequences, split testing, detailed deliverability dashboards and much more. We help you follow industry best practices, one email at a time.
Try Woodpecker for free today.