5 Apollo Email Warmup Alternatives in 2025 (Since Apollo Dropped Theirs)

In 2024, Apollo silently pulled its warmup feature, leaving cold outreach teams in the dark. Their replacement, "Inbox Ramp Up," just drips emails without building a reputation. No engagement, no tracking, no protection.
If your reply rates have tanked or emails keep getting sent to spam, you're not imagining things. You're experiencing what happens when volume pacing gets mistaken for real warmup.
This guide breaks down the five email warmup tools that actually fix deliverability for users who have used Apollo email warmup. These aren't integrations or all-in-one platforms. They're specialized warmup engines built to: protect your domain, improve inbox placement, and restore trust with mailbox providers.

But…

Apollo Says “Inbox Ramp Up” Is a Warmup Tool. Is It, Really?

Certainly, not. Apollo positions Inbox Ramp Up as a warmup feature, but all it does is drip emails. That’s not a warmup. 

A real warm-up tool builds sender reputation through engagement, including opens, replies, and spam folder rescue. It monitors where emails land and alerts you to DNS issues before they kill campaigns. 

Apollo’s Inbox Ramp Up does none of this:

• Engagement simulation (opens, replies, spam recovery)
  
  
• Inbox placement visibility (Gmail, Outlook, etc.)
  
  
• SPF, DKIM, or DMARC alerts
  
  
• Blacklist or domain health monitoring
  
  
• Multi-inbox dashboard or deliverability diagnostics

That’s the kind of support real warmup tools provide, and the five below actually deliver.

Top 5 Dedicated Warmup Tools That Actually Work in 2025

1. MailReach

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MailReach is built for outbound sales teams, lead-gen agencies, and growing companies managing multiple inboxes who treat cold outreach seriously. It builds reputation through real interactions and goes deeper than most tools by helping you pinpoint exactly why emails aren’t landing.

Unlike Apollo’s volume-only ramp-up or tools overloaded with cosmetic fluff, MailReach fixes deliverability at its root, with up to 100 warm-up emails/day, 30K+ inbox network, blacklist alerts, DNS checks, and inbox placement insights.

Features 

Auto warmup with real inboxes

MailReach sends, opens, replies, and archives messages using a network of 30K+ real inboxes (Gmail, Outlook, etc.). Warmup runs in the background and even cleans up test messages afterward.

High-quality warm-up network

With Mailreach, your email warm-up campaign is done with a high-quality network mostly composed of Google Workspace and Office 365 inboxes, with an average network reputation score of 95+.

This is a major advantage compared to most tools, which have their warm-up networks crowded with custom SMTP mailboxes. Receiving positive interactions from custom SMTP mailboxes doesn't have a positive impact—you want to receive positive interactions from Google and Microsoft.

Inbox placement monitoring

Tracks exactly where your emails land: inbox, promotions, or spam, before a single campaign goes live. Provides per-inbox, per-domain, or per-sequence insights across Gmail, Outlook, Yahoo, and more.

Spam test tool

Scans your email content for spam triggers like risky phrases, ALL CAPS, or shady links. (Comes with 20 credits per inbox. You can buy more if needed.)

‍Run a spam test now

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DNS authentication & blacklist checks

Detects missing or broken SPF, DKIM, and DMARC records. Also scans public blacklists to catch red flags early.

Smart, human-like pacing   

Randomizes time, volume, and behavior to mimic real inbox activity so no two warmups look the same.   

Email warmup API

Manages warmup at scale, automates warmup flows, and integrates with your outbound stack.

Seamless provider integration

Works with Gmail, Google Workspace, O365, Outlook, Zoho, Yahoo, Exchange, and any SMTP/IMAP provider.

Pros:

• Easy to use for non-tech users (G2)
• Focus on deliverability features that deliver guaranteed results 
• Great customer support (G2)

Cons:

• Doesn’t use your own cold email templates for warmup (by design, to protect deliverability)
• Comes with 20 spam test credits per inbox; more are paid

Pricing 

• It’s $25/month per inbox for 1–5 inboxes, $19.50 for 6+, and $16 for 50+ inboxes
• 20 Spam Test credits included per inbox 
• Annual billing saves you 20%
• While there’s no free tier, the pricing is competitive given the advanced deliverability tools included

2. Warmup Inbox

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Warmup Inbox offers an affordable warmup with basic customization. It connects your inbox to a network of ~20,000 accounts to simulate peer-to-peer engagement (sending, replying, archiving, etc.) and gradually build sender reputation.

Features

• Provides a Reputation Score for your inbox and alerts you if it drops, so you can pause sending or take corrective action. It also runs blacklist checks to ensure your domain or IP hasn’t been flagged.
• Let's you customize subject lines and templates for warmup messages, which can be helpful if you care about brand consistency, even during warmup (though this is cosmetic, not functional).
• Offers a clean dashboard with health tracking and performance history.
• Supports all major platforms: Gmail, Google Workspace, Office 365, Outlook, Yahoo, Zoho, Amazon SES, SendGrid, and any custom SMTP provider.

Pros:

• Easy to use, beginner-friendly setup with one-click onboarding
• Reputation Score is useful for spotting early deliverability issues
• Flexible warmup settings let you control sending volume and schedule. (G2)
• Works with a wide range of inbox types and SMTP services.
• 7-day free trial with no credit card required.

Cons:

• G2 users report warmup limits on some inbox types unless you upgrade 
• Not suitable as an email marketing solution for those looking for an all-in-one tool. (G2)
• Lacks team or sub-account support, making multi-inbox management harder at scale. (G2)
• The “custom warmup templates” feature is cosmetic. It doesn’t affect real inbox trust and may give a false sense of security

Pricing (per inbox): 

• Basic: $19/month ($15/mo billed annually): 75 warmups/day
• Pro: $59/month ($49/mo billed annually): 250 warmups/day, advanced timing, template stats, multilingual support
• Max: $99/month ($79/mo billed annually): 1000 warmups/day, API access, technical onboarding, and priority support

 ⚠️ No bulk pricing; managing multiple inboxes gets expensive fast.

3. Warmbox

Warmbox is a high-end warmup tool designed for teams that want complete control over how their warmup behaves. It uses GPT-4 to generate realistic multi-thread conversations and offers deep customization across warmup pacing, engagement actions, and reputation tracking.

Features

• Auto warmup via 35K+ inbox network with open, reply, bookmark, and spam recovery actions
• GPT-4-powered emails simulate human-like conversations with unique content per thread
• Flexible scheduling with multiple warmup modes: Growth, Flat, Random, or fully custom
• Detailed dashboard tracks warmup volume, reply/open rates, and inbox health score
• DNS authentication and blacklist monitoring built-in
• Team dashboard with role-based access and support for multiple inboxes under one account
• Works with all major providers, including Gmail, Outlook, SMTP/IMAP services
  
  

Pros:

• GPT-4 emails create natural, evolving threads, not just one-off messages
• Fully customizable pacing and warmup behavior
• Tracks inbox placement and spam pulls in detail
• Team-friendly features with shared access and advanced analytics

Cons:

• Higher per-inbox cost than other tools unless you’re on a large plan
• No pricing flexibility—tiers are fixed by inbox volume
• No standalone spam testing or email diagnostics outside of warmup mode
  
  

Pricing

• Solo: $19/month – 1 inbox, 50 warmups/day
• Startup: $79/month – 3 inboxes, 250 warmups/day
• Growth: $159/month – 6 inboxes, 500 warmups/day
• Annual billing knocks ~20% off (Solo becomes $15/month)‍
• Custom plans available for larger teams; no à la carte inbox pricing

4. Warmy

Warmy is designed for senders with very high warmup volume needs, supporting up to 2,000 warmup emails/day per inbox on premium plans. It’s also one of the few tools that supports multi-language warmups and template customization, making it a decent fit for international teams with aggressive outreach goals.

While features like multi-language support and template customization sound useful, they’re cosmetic. B2B outreach depends on reputation, placement accuracy, and inbox quality, not how many languages your warm-up emails are written in.

Features:

• Simulates engagement by sending, opening, replying, bookmarking, and pulling emails out of spam folders across real user inboxes.
• Uses Adeline AI to dynamically adjust warmup volume, sending frequency, and reply rate based on real-time inbox performance. 
• Displays a composite “Sender Health Score” with metrics like open rate, click rate, reply rate, and Gmail-specific insights via Google Postmaster Tools.
• Works with any mailbox using SMTP, including Gmail, Outlook, Amazon SES, Mailgun, and SendGrid.

Pros:

• Uses natural mail timing and AI-generated replies to simulate real interactions. (G2)
• Built for high-volume senders and aggressive ramp-ups. 
• Help with B2C emailing

Cons:

• No API for bulk domain management, challenging for teams handling 50+ domains. (G2)
• Initial setup can be confusing for users new to warmup tools. (G2)
• Pricey compared to other tools, especially without team-level discounts

Pricing

Warmy doesn’t publicly list pricing on its website but based on G2 insights:

• Starter: $49/month per inbox – ~100 warmup emails/day
• Business: $129/month – ~300 warmups/day, more advanced deliverability features
• Premium: $189/month – ~1,000 warmups/day
• Platinum: $279/month – up to 2,000 warmups/day and enterprise-level support

Warmy also offers a 7-day free trial. 

Note: Pricing is on the higher side compared to tools like MailReach or Warmup Inbox.

5. Lemwarm

Lemwarm is Lemlist’s built-in warmup tool that connects to 10,000+ real inboxes to simulate human-like interactions and build sender reputation. It's best suited for users already sending cold outreach via Lemlist and want warmup, diagnostics, and optimization in the same ecosystem. The Smart Plan adds personalization options and campaign-level feedback.

Features:

• Runs continuously (including weekends) and adapts warmup volume over time to prevent sudden spikes.
• Allows use of actual cold outreach templates for warmup (Smart Plan).
• Automatically verifies SPF, DKIM, and DMARC authentication.
• Warm-up performance feeds directly into Lemlist campaign logic, helping optimize sending strategies.
• Supports Gmail, Outlook, SMTP, and other providers via Lemlist integration.

Pros:

• Native to Lemlist—warmup, campaigns, and analytics in one place
• Smart Cluster feature adds ICP-level personalization to replies
• Ongoing warmup adapts to your sending behavior and domain health

Cons:

• High cost for full features if you're not using Lemlist
• Surface-level spam test does not measure deliverability accurately
• Smart Plan required for deeper diagnostics

Pricing

• Essential: $29/month per inbox ($24/month annually)—includes basic warmup, SPF/DKIM/DMARC checks, and core deliverability monitoring.
• Smart: $49/month per inbox ($40/month annually)—adds Smart Cluster personalization, use of custom templates, and advanced deliverability features.

For warming a large number of inboxes, Lemwarm can get pricey (10 inboxes on Smart would be $490/month). Lemlist/Lemwarm occasionally offers bundle deals for agencies.

Choose the Right Warmup Tool for Real Deliverability

If you’re replacing the Apollo warmup feature, your choice depends on how many inboxes you manage and how seriously you take deliverability.

If all you need is a basic warmup, there are plenty of tools that check that box. But if your cold emails are landing in spam, or you’re scaling across teams, clients, or domains, you need more than volume control. You need inbox-level visibility, reputation repair, and a system that builds real trust with Gmail and Outlook.

‍MailReach is the tool that offers all of that, plus real engagement simulation, domain health monitoring, and spam recovery.

‍👉 Start Your Warmup with MailReach