MailRush.io vs Warmy: Cold Email Platform vs Email Warmup Tool Comparison
Compare MailRush.io (cold email platform) and Warmy (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 built for outreach and follow-ups, starting at $19/mo, while Warmy is an email warmup tool built for domain warming and deliverability, priced through custom quotes. MailRush.io lists 11 features including unlimited senders and unlimited email warming, Warmy lists 8 including email warm-up and seed lists, and many teams run both together.
Key takeaways
- MailRush.io publishes an entry price of $19/mo for its Starter plan, covering up to 1,000 contacts and up to 5,000 emails per month.
- Warmy uses custom, contact-sales pricing across its B2B sender, B2C sender, and Custom plan tiers, with volume-based pricing instead of a published price.
- MailRush.io lists 11 total features, including unlimited senders, unlimited email warming, email validation, and Zapier integrations.
- Warmy lists 8 total features, including email warm-up, email seed list, Google Postmaster integration, and a dedicated deliverability expert.
- MailRush.io integrates with SMTP, IMAP, Zapier, and Webhooks, while Warmy integrates with Google Workspace, Microsoft 365, Gmail, Yahoo, Outlook, and Google Postmaster.
Reviewed and updated September 2, 2026
MailRush.io vs Warmy: Cold Email Platform vs Email Warmup Tool Comparison
Sales teams building an outbound stack often weigh MailRush.io, a cold email platform for cold email outreach, against Warmy, an email warmup tool for email domain warming and deliverability. They cover different parts of the workflow, so this comparison covers what each one does, what each one costs, and where they overlap.
The Quick Answer
MailRush.io is a cold email platform for cold email outreach; Warmy 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 Warmy lists email warm-up and email seed list.
MailRush.io publishes an entry price of $19/mo; Warmy uses custom pricing, so the two cannot be compared on list price.
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 Warmy. 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.
Warmy is Automated email deliverability tool that warms up domains and IPs with AI-driven automation and a network of business or consumer mailboxes. Adds Google Postmaster integration, seed lists, deliverability insights and email verification in the same platform.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Starter
B2B sender
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
Warmy Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| B2B sender | Contact Sales | Reach Businesses | Volume-based pricing |
| B2C sender | Contact Sales | Reach Consumers | Volume-based pricing |
| Custom plan | Contact Sales | Custom Solution | Volume-based pricing |
Source: Warmy Pricing
Pricing Analysis
One or both platforms use custom or contact-based pricing for some tiers. Reach out to their sales teams for exact quotes based on your usage needs.
Features Breakdown
- Unlimited senders
- Unlimited email warming
- Email validation
- API access & Webhooks
- Zapier integrations
- Spintax support
- and 5 more listed below
- Email Warm-Up
- Email Seed List
- Deliverability Insights
- Google Postmaster Integration
- Email Verification
- Warmy API
- 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
Warmy Key Features
- Email Warm-Up
- Email Seed List
- Deliverability Insights
- Google Postmaster Integration
- Email Verification
- Warmy API
- Deliverability monitor
- Dedicated deliverability expert
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 Warmy
- Email Warm-Up
- Email Seed List
- Deliverability Insights
- Google Postmaster Integration
- Email Verification
- Warmy API
- Deliverability monitor
- Dedicated deliverability expert
Integration Ecosystem
MailRush.io Integrations
MailRush.io connects with: SMTP, IMAP, Zapier, Webhooks.
Warmy Integrations
Warmy connects with: Google Workspace, Microsoft 365, Gmail, Yahoo, Outlook, Google Postmaster.
Integrations listed only by MailRush.io: SMTP, IMAP, Zapier, Webhooks.
Integrations listed only by Warmy: Google Workspace, Microsoft 365, Gmail, Yahoo, Outlook, Google Postmaster.
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 Warmy
- Organizations with complex tech stacks needing broad integration support (6 integrations)
- Enterprise buyers who prefer custom pricing and dedicated support
- Teams launching new email domains for outreach
- Organizations recovering from deliverability issues
Feature Comparison Summary
| Feature | MailRush.io | Warmy |
|---|---|---|
| Starting Price | $19/mo | Contact Sales |
| Top Tier Price | $99/mo | Contact Sales |
| Total Features Listed | 11 | 8 |
| Integrations | 4 | 6 |
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 Warmy the email domain warming and deliverability side. MailRush.io publishes an entry price of $19/mo, while Warmy uses custom pricing for its plans, so compare on features and on the quote you receive. 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 Warmy for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between MailRush.io and Warmy?
- MailRush.io is a cold email platform for cold email outreach, while Warmy is an email warmup tool for email domain warming and deliverability. MailRush.io automates outreach and follow-ups from your own mailboxes or MailRush-provided accounts, and Warmy focuses on warming domains and IPs using AI-driven automation and a network of mailboxes.
- How much does MailRush.io cost compared to Warmy?
- MailRush.io publishes an entry price of $19/mo for its Starter plan, rising to $99/mo for the Scale plan. Warmy uses custom, contact-sales pricing across all its plans, including B2B sender, B2C sender, and Custom plan tiers, so the two cannot be compared on list price.
- Do I need both MailRush.io and Warmy?
- Many teams run one of each, according to the article. MailRush.io is built for sending campaigns that land in the inbox and generate replies, while Warmy is built for building sender reputation and improving inbox placement, so they cover different parts of the outbound workflow.
- Does MailRush.io include email warmup, or do I need Warmy for that?
- MailRush.io includes unlimited email warming and email validation in every plan, so it does offer warmup functionality on its own. Warmy, however, offers additional deliverability-specific features like Google Postmaster integration, seed lists, deliverability insights, and email verification within the same platform.
- What integrations does each platform support?
- MailRush.io connects with SMTP, IMAP, Zapier, and Webhooks. Warmy connects with Google Workspace, Microsoft 365, Gmail, Yahoo, Outlook, and Google Postmaster, giving it a broader integration list with six connections compared to MailRush.io's four.
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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