%20(1).png)
lemwarm is the warm-up tool that comes bundled with lemlist, which means a lot of cold emailers end up using it by default. If you already pay for lemlist, the Essential warm-up plan is free. Hard to argue with that.
"Free with your existing subscription" and "actually good at keeping you in the inbox" aren't the same thing though.
We went through user reviews from G2, Reddit, Capterra, and cold email communities to see how lemwarm holds up when it matters most. Here's what we found.
lemwarm is a warm-up automation tool built by the team at lemlist. It connects your inbox to a shared network of mailboxes and automatically simulates engagement activity to boost your sender reputation.
That includes:
The theory behind this is simple:
If mailbox providers see positive engagement, they'll be more likely to place your emails in the inbox when you launch real campaigns.
But theory doesn't always match reality, especially when engagement isn't coming from real recipients or isn't diverse enough to reflect normal usage.
lemwarm offers two plans, both priced per inbox:
If you already pay for lemlist (Email Pro, Multichannel Expert, or Outreach Scale plans), you get the Essential warm-up plan at no extra cost. Upgrading to Smart still costs $20/month per inbox for lemlist users.
The per-inbox model is fine when you're warming up one or two accounts. But the math gets rough at scale. Warming 10 inboxes on the Smart plan costs $490/month. Warming 50 inboxes? $2,450/month.
Compare that to Mailivery's flat pricing: $199/month for up to 2,000 warm-up emails per day across unlimited inboxes.
We pulled insights from Reddit, G2, LinkedIn, Quora, and more. While reviews vary, several consistent patterns emerged.
Many users report early improvements in inbox placement. lemwarm helps reduce spam complaints and increase open rates in the first few weeks.
But when teams ramp up volume or begin sending cold campaigns, those gains tend to taper off.
This is especially common among agencies or teams using multiple inboxes. The initial lift doesn't hold under scale, which suggests the warm-up activity isn't building long-term domain trust.
lemwarm says its warm-up network spans over 100 countries, using inboxes from real users across the globe to simulate engagement.
That sounds impressive on the surface. A global footprint implies diversity, credibility, and a broader sender reputation.
But here's the part lemwarm doesn't clarify:
The value of a warm-up network isn't just about how many countries it includes. It's about where those inboxes are based, how engaged they are, and how mailbox providers perceive them.
Without transparency into inbox location, configuration, and behavior, you're left guessing. And in deliverability, guessing is a liability.
Real warm-up value comes from trusted, monitored inboxes, not just global coverage.
lemwarm's UI gets consistent praise.
It's easy to set up, with a minimal learning curve. If you're a lemlist user, integration is seamless. New users can launch a warm-up campaign within minutes.
This makes lemwarm appealing to solo founders, freelancers, or small teams.
But that simplicity also comes with limitations. There's little flexibility for advanced users, no inbox-level customization, and limited reporting.
One limitation that doesn't get enough attention: lemwarm's Essential plan caps warm-up volume at 40 emails per day.
If you follow the common guidance of keeping your warm-up volume at 10-50% of your cold email volume, that means you shouldn't exceed more than 20 outreach emails per day on the Essential plan. For teams running serious outbound, that's a bottleneck.
The Smart plan raises this cap, but at $49/month per inbox, you're paying a premium just to send more warm-up emails.
The biggest issue isn't the UX, or even the pricing. It's the limited scope of what lemwarm offers.
lemwarm does a solid job helping you get started with inbox warm-up, especially if you're new to cold email. But when your outreach scales, or when deliverability becomes a bigger challenge, the tool doesn't offer enough to support long-term inbox placement.
Here's what it's missing:
lemwarm gives you a good starting point. But if you're managing outreach across multiple domains, trying to scale consistently, or recovering from deliverability issues, you'll likely need more than basic warm-up automation. Mailivery offers the tools and infrastructure to support that next level.
When lemwarm starts to fall short, experienced teams look for tools that offer more than warm-up simulation.
Mailivery is one of those tools, and it's gaining traction among agencies and SaaS teams.
It positions itself not as a warm-up utility, but as a full deliverability platform. That difference matters.
Here's how it stands apart:
Mailivery uses a vetted pool of over 100,000 monitored inboxes. There are no bots, no fake domains. Engagement runs through IMAP and SMTP, not browser emulation.
There's no per-inbox pricing. You pay based on total daily warm-up volume, whether that's 3 inboxes or 300. Plans start at $29/month for 200 warm-up emails/day across unlimited inboxes.
Beyond warm-up, Mailivery includes:
It's designed to protect sender reputation across all phases of outreach.
Mailivery works directly with agencies and platform partners to improve features based on feedback, not tickets or bots.
If your goal is to stay in the inbox, not just get there once, you need tools that go deeper than lemwarm.
Check out our full comparison of the best email warm-up tools for more options.
lemwarm's Essential plan costs $29/month per inbox ($24/month on annual billing). The Smart plan costs $49/month per inbox ($40/month annually). Both plans are priced per inbox, so costs scale linearly as you add more email accounts.
Yes. If you have a paid lemlist seat on the Email Pro, Multichannel Expert, or Outreach Scale plans, you get the Essential warm-up plan at no extra cost. Upgrading to the Smart plan still costs $20/month per inbox.
On the Essential plan, lemwarm caps warm-up emails at 40 per day per inbox. The Smart plan allows higher volumes. This cap can limit how much cold email you should send alongside warm-up.
For agencies managing more than a handful of inboxes, lemwarm's per-inbox pricing adds up fast. At 20 inboxes on the Smart plan, you're looking at nearly $1,000/month just for warm-up. Tools like Mailivery offer unlimited inboxes on flat-rate plans, which makes more sense at that scale.
Mailivery is a strong alternative for teams that need to warm up multiple inboxes without per-inbox fees. It includes email verification, blacklist monitoring, and a full REST API on every plan. Pricing starts at $29/month for unlimited inboxes.
Yes. lemwarm supports any email provider that allows IMAP and SMTP access, including Gmail, Google Workspace, Microsoft 365, and Outlook.
The easiest way to get responses to your cold emails.
