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Warmup Tools
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Blog > Catalog > Warmup
By Nikita Bykadarov, CEO of Maildoso · Updated June 12, 2026
Introduction
Every new mailbox needs to build a reputation before it can send real volume, and warmup is how that's done: a gradual ramp of sends paired with positive engagement signals. But warmup in 2026 is not what it was in 2021 – Gmail, Yahoo, and Microsoft have gotten good at spotting the fake engagement that many warmup networks rely on, and getting caught can hurt deliverability instead of helping it.
This page compares the leading warmup tools on method, pricing, and honesty about what actually works. Below you'll find a short buyer's guide and a breakdown of each tool, so you can warm up new inboxes without quietly damaging them.
This page compares the leading warmup tools on method, pricing, and honesty about what actually works. Below you'll find a short buyer's guide and a breakdown of each tool, so you can warm up new inboxes without quietly damaging them.
Written by Nikita Bykadarov, CEO of Maildoso. Maildoso runs cold email infrastructure for 6,000+ companies, so Nikita's team watches what warmup does to real domains – which methods build reputation and which trip filters. This guide is written from that deliverability-first view.
Last updated: June 2026.
Last updated: June 2026.
How we rank platforms
We score each warmup tool on five things that decide real deliverability results:
Method – how natural the warmup activity looks to Gmail, Yahoo, and Microsoft, versus obvious bot patterns.
Network quality – the size, age, and realism of the mailbox pool generating engagement.
Ramp and control – whether volume increases gradually, and how much you can tune it.
Monitoring – whether it also tracks placement and reputation, or just warms.
Pricing model – per-inbox versus flat, and how cost scales as you add mailboxes.
Method carries the most weight. In 2026, crude bot-network warmup can do more harm than good, so a tool that mimics real engagement and ramps slowly beats one that just inflates open counts. Warmup that trips filters is worse than no warmup at all.
Method – how natural the warmup activity looks to Gmail, Yahoo, and Microsoft, versus obvious bot patterns.
Network quality – the size, age, and realism of the mailbox pool generating engagement.
Ramp and control – whether volume increases gradually, and how much you can tune it.
Monitoring – whether it also tracks placement and reputation, or just warms.
Pricing model – per-inbox versus flat, and how cost scales as you add mailboxes.
Method carries the most weight. In 2026, crude bot-network warmup can do more harm than good, so a tool that mimics real engagement and ramps slowly beats one that just inflates open counts. Warmup that trips filters is worse than no warmup at all.
Tool comparison
Tool
Best for
Pricing model
Key strength
Mailreach
Warmup + monitoring
Per inbox (~$25)
Reliable warmup with deliverability monitoring
TrulyInbox
Large teams & agencies
Flat, unlimited inboxes
Many mailboxes at one price
Warmbox
Simple, solid warmup
Per inbox (~$15)
Large, aged mailbox network
Warmup Inbox
Low-cost entry
Per inbox (~$15)
Cheapest way to start
Mailivery
AI behavioral warmup
Per inbox
AI-driven, human-like patterns
Warmy.io
Premium warmup + deliverability suite
Per inbox (~$49)
Top-rated, feature-rich platform
Mailwarm
Basic warmup, a known name
Per inbox (~$69)
Early-mover simplicity
InboxAlly
Reputation repair
Per inbox (~$149)
Engagement-driven, premium
Lemwarm
Lemlist users
Free with Lemlist / per inbox
Bundled with Lemlist
Folderly
Full deliverability platform
Per mailbox (~$120)
All-in-one warmup + testing + audits
How to choose a sequencer
🔹 Judge the method, not the dashboard
The single biggest factor in 2026 is how realistic the warmup looks. Tools that fake opens and clicks through obvious bot networks are increasingly detected by Gmail and Yahoo, and detection can hurt your reputation. Favor tools that ramp slowly and mimic genuine engagement.
🔹 Match the pricing model to your scale
Per-inbox pricing (Mailreach, Warmbox, Warmup Inbox) is fine for a few mailboxes but adds up fast at agency scale. Flat, unlimited-inbox pricing (TrulyInbox) is far cheaper once you run dozens of inboxes.
🔹 Decide if you need monitoring too
Some tools only warm; others, like Mailreach, also track inbox placement and reputation over time. If you want one tool for both, that's worth paying for.
🔹 Plan for the time it takes
A new domain needs roughly 4-8 weeks of warmup to reach real sending volume safely. Anything faster risks long-term reputation damage, so don't trust a tool that promises to "warm up in days."
🔹 Check what's already bundled
Many sequencers and infrastructure providers include warmup. If yours does, a separate tool may be redundant – check before you pay twice.
Warmup builds reputation, but it can't fix a weak foundation. Without proper authentication (SPF, DKIM, DMARC) and clean, dedicated domains, no amount of warmup will keep you in the inbox – which is what the email infrastructure and deliverability categories cover.
The single biggest factor in 2026 is how realistic the warmup looks. Tools that fake opens and clicks through obvious bot networks are increasingly detected by Gmail and Yahoo, and detection can hurt your reputation. Favor tools that ramp slowly and mimic genuine engagement.
🔹 Match the pricing model to your scale
Per-inbox pricing (Mailreach, Warmbox, Warmup Inbox) is fine for a few mailboxes but adds up fast at agency scale. Flat, unlimited-inbox pricing (TrulyInbox) is far cheaper once you run dozens of inboxes.
🔹 Decide if you need monitoring too
Some tools only warm; others, like Mailreach, also track inbox placement and reputation over time. If you want one tool for both, that's worth paying for.
🔹 Plan for the time it takes
A new domain needs roughly 4-8 weeks of warmup to reach real sending volume safely. Anything faster risks long-term reputation damage, so don't trust a tool that promises to "warm up in days."
🔹 Check what's already bundled
Many sequencers and infrastructure providers include warmup. If yours does, a separate tool may be redundant – check before you pay twice.
Warmup builds reputation, but it can't fix a weak foundation. Without proper authentication (SPF, DKIM, DMARC) and clean, dedicated domains, no amount of warmup will keep you in the inbox – which is what the email infrastructure and deliverability categories cover.
The platforms
FAQ
- Q:What is email warmup?A:The process of gradually increasing sending from a new inbox or domain while generating positive engagement – opens, replies, and spam rescues – to build a sender reputation with Gmail, Yahoo, and Microsoft before you send real campaigns.
- Q:Does email warmup still work in 2026?A:Authentic warmup – a slow ramp with realistic engagement and clean authentication – still works. Crude bot-network warmup is less effective than it was in 2021-2022, and when filters detect the fake patterns it can actively hurt your deliverability.
- Q:How long does email warmup take?A:A new domain typically needs 4-8 weeks to reach full sending volume safely. Rushing it risks long-term reputation damage, so treat fast-warmup promises with caution.
- Q:How much do warmup tools cost?A:Per-inbox tools run roughly $15-$25 per inbox per month (Warmbox, Warmup Inbox, Mailreach), while flat-rate tools like TrulyInbox offer unlimited mailboxes from around $22-$29/month.
- Q:Do I need a separate warmup tool?A:Not always. Many sequencers and infrastructure providers bundle warmup. Check what you already have before paying for a standalone tool.
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