MailRush.io vs Warmforge: Cold Email Platform vs Email Warmup Tool Comparison
Compare MailRush.io (cold email platform) and Warmforge (email warmup tool) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
MailRush.io is a cold email platform for sending outreach campaigns and follow-ups, priced from $19/mo, while Warmforge is an email warmup tool for building sender reputation and inbox placement, priced from $12/mo. MailRush.io lists unlimited senders and warming; Warmforge lists Heat Score tracking and placement tests. Many teams use both together.
Key takeaways
- MailRush.io's Starter plan costs $19/mo for up to 1,000 contacts and up to 5,000 emails per month.
- Warmforge's Email Warm Up plan costs $12/mo per slot, with one free slot and one free placement test per month included.
- MailRush.io lists 11 features including unlimited senders, unlimited email warming, and email validation.
- Warmforge lists 8 features including Heat Score per mailbox and health checks on DNS records, MX records, and blacklist status.
- MailRush.io integrates with SMTP, IMAP, Zapier, and Webhooks, while Warmforge integrates with Google Workspace, Microsoft 365, Gmail, Outlook, Salesforge, and Mailforge.
Reviewed and updated September 2, 2026
MailRush.io vs Warmforge: Cold Email Platform vs Email Warmup Tool Comparison
MailRush.io is a cold email platform; Warmforge is an email warmup tool. Whether you need one, the other, or both depends on which part of the workflow you are buying for: cold email outreach on one side, email domain warming and deliverability on the other. This guide lays out what each vendor publishes.
The Quick Answer
MailRush.io is a cold email platform for cold email outreach; Warmforge is an email warmup tool for email domain warming and deliverability. By each vendor's own wording, MailRush.io lists unlimited senders and unlimited email warming, and Warmforge lists email warm up and monitoring & health checks.
Warmforge offers a lower entry point at $12/mo compared to MailRush.io at $19/mo.
If your priority is sending campaigns that land in the inbox and generate replies, MailRush.io is the one built for it; for building sender reputation and improving inbox placement, that is Warmforge. Many teams run one of each.
Understanding the Core Difference
MailRush.io is Cold email software that automates outreach and multi-step follow-ups from your own SMTP/IMAP mailboxes or MailRush-provided sending accounts. Email warmup and email validation are included in every plan.
Warmforge is Email warm up tool from the Forge Ecosystem that warms mailboxes with AI-written emails and tracks a per-mailbox Heat Score. Adds DNS, MX and blacklist health checks, placement tests and automatic removal of warm-up mail that lands in spam.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Starter
Email Warm Up (per slot)
MailRush.io Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Starter | $19/mo | Up to 1,000 contacts | Up to 5,000 emails per month; up to 1,000 emails per day |
| Pro | $39/mo | Up to 30,000 contacts | Up to 10,000 emails per month; up to 1,500 emails per day |
| Scale | $99/mo | Up to 50,000 contacts | Up to 25,000 emails per month; up to 3,000 emails per day |
Source: MailRush.io Pricing
Warmforge Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Email Warm Up (per slot) | $12/mo | 1 slot covers 1 mailbox; 1 free slot included | Automated AI email warm up; 1 free placement test per month |
| Placement Tests Pro Plan | $39/mo | 50 mailboxes per test | 100 tests per month |
| Placement Tests Growth Plan | $169/mo | 250 mailboxes per test | Unlimited tests |
Source: Warmforge Pricing
Pricing Analysis
Warmforge offers the lower entry point ($12/mo vs $19/mo). Teams watching their budget will appreciate the savings, especially when starting out.
Features Breakdown
- Unlimited senders
- Unlimited email warming
- Email validation
- API access & Webhooks
- Zapier integrations
- Spintax support
- and 5 more listed below
- Email Warm Up
- Monitoring & Health Checks
- Placement Tests
- Deliverability Boost
- Always-On Warm Up
- Heat Score per mailbox
- and 2 more listed below
MailRush.io Key Features
- Unlimited senders
- Unlimited email warming
- Email validation
- API access & Webhooks
- Zapier integrations
- Spintax support
- Email follow-ups
- Suppression list
- Email copy spam assessment
- Email personalization
- Unsubscription automation
Warmforge Key Features
- Email Warm Up
- Monitoring & Health Checks
- Placement Tests
- Deliverability Boost
- Always-On Warm Up
- Heat Score per mailbox
- Health Checks on DNS and MX records and blacklist status
- Unique emails written by AI
The two lists below are a diff of each vendor's own feature list by exact wording, so a capability both tools offer can appear on either side under a different name.
Listed only by MailRush.io
- Unlimited senders
- Unlimited email warming
- Email validation
- API access & Webhooks
- Zapier integrations
- Spintax support
- Email follow-ups
- Suppression list
- Email copy spam assessment
- Email personalization
- Unsubscription automation
Listed only by Warmforge
- Email Warm Up
- Monitoring & Health Checks
- Placement Tests
- Deliverability Boost
- Always-On Warm Up
- Heat Score per mailbox
- Health Checks on DNS and MX records and blacklist status
- Unique emails written by AI
Integration Ecosystem
MailRush.io Integrations
MailRush.io connects with: SMTP, IMAP, Zapier, Webhooks.
Warmforge Integrations
Warmforge connects with: Google Workspace, Microsoft 365, Gmail, Outlook, Salesforge (native), Mailforge (native).
Integrations listed only by MailRush.io: SMTP, IMAP, Zapier, Webhooks.
Integrations listed only by Warmforge: Google Workspace, Microsoft 365, Gmail, Outlook, Salesforge (native), Mailforge (native).
Use Case Recommendations
Best Fit for MailRush.io
- Budget-conscious teams looking for an affordable cold email platform
- Teams that need a wide feature set (11 capabilities listed)
- Sales teams running high-volume outbound email campaigns
- Agencies managing multiple client outreach programs
Best Fit for Warmforge
- Budget-conscious teams looking for an affordable email warmup tool
- Organizations with complex tech stacks needing broad integration support (6 integrations)
- Teams launching new email domains for outreach
- Organizations recovering from deliverability issues
Feature Comparison Summary
| Feature | MailRush.io | Warmforge |
|---|---|---|
| Starting Price | $19/mo | $12/mo |
| Top Tier Price | $99/mo | $169/mo |
| Total Features Listed | 11 | 8 |
| Integrations | 4 | 6 |
| Founded | N/A | 2024 |
Getting Started Checklist
- Define your cold email outreach and email domain warming and deliverability requirements and monthly budget
- Estimate your expected email sending volume and warmup email volume to find the right tier
- List the integrations your team currently relies on
- Sign up for free trials or demos of both platforms
- Run a small test with each tool before making a commitment
- Evaluate the onboarding experience and support quality
Final Thoughts
MailRush.io serves the cold email outreach side of an outbound stack and Warmforge the email domain warming and deliverability side. Warmforge offers a more accessible entry point at $12/mo, while MailRush.io starts at $19/mo. Your decision should weigh pricing against the specific features that matter most for your workflow.
Start with a trial of each to see which platform fits your team's daily process. The best tool is the one your team actually uses consistently.
Pricing and features verified as of September 2026. Visit MailRush.io and Warmforge for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between MailRush.io and Warmforge?
- MailRush.io is a cold email platform built for sending outreach campaigns and follow-ups, while Warmforge is an email warmup tool built for building sender reputation and improving inbox placement. Many teams use both together, one for sending campaigns and one for protecting deliverability.
- How much does MailRush.io cost?
- MailRush.io's Starter plan costs $19/mo for up to 1,000 contacts and up to 5,000 emails per month. Its Pro plan is $39/mo for up to 30,000 contacts, and its Scale plan is $99/mo for up to 50,000 contacts.
- How much does Warmforge cost?
- Warmforge's Email Warm Up plan costs $12/mo per slot, covering one mailbox with one free slot and one free placement test per month included. Its Placement Tests Pro plan costs $39/mo and its Growth plan costs $169/mo.
- Can I use MailRush.io and Warmforge together?
- Yes, the article notes that many teams run one of each, using MailRush.io for sending cold email campaigns and Warmforge for warming domains and monitoring deliverability. They serve different parts of the outreach workflow rather than competing directly.
- What integrations does each platform support?
- MailRush.io connects with SMTP, IMAP, Zapier, and Webhooks. Warmforge connects with Google Workspace, Microsoft 365, Gmail, Outlook, and its native tools Salesforge and Mailforge.
About the author.
Tim Carden is CMO / CTO at RevenueFlow, which builds and operates outbound revenue engines for B2B companies. Studied at McGill University.
Tim Carden · CMO / CTO
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