What is lemwarm?
lemwarm is an email warmup and deliverability tool that builds a sender's reputation with inbox providers before and during cold email campaigns. It connects to your mailbox and automatically exchanges emails with a large network of real inboxes across many domains and countries. That steady, natural-looking activity gives providers like Gmail and Outlook a positive sending history, which helps your real outreach land in the inbox.
Made by lempire, the company behind lemlist, lemwarm can be bought on its own or used for free as part of any lemlist plan. Alongside warmup, it scores your deliverability, checks technical setup such as SPF, DKIM, DMARC and MX records, sends alerts about spam risks and offers daily tips. Its higher plan adds personalized warmup emails, warmup of your actual templates and industry-specific networks.
lemwarm at a glance
How does lemwarm work?
- Connect your inbox
Link the mailbox you plan to use for outreach, and lemwarm starts sending and receiving warmup emails.
- Set the pace
Choose how quickly warmup volume ramps up, and lemwarm handles the daily activity.
- Check your setup
Run the technical setup check to catch problems with SPF, DKIM, DMARC or MX records.
- Monitor your score
Follow your deliverability score, alerts and daily tips, and adjust before launching campaigns.
lemwarm key features
Automated warmup network
Exchanges emails with a network of more than 20,000 domains in over 100 countries.
Deliverability score
A running score with alerts when your sending reputation is at risk.
Technical setup check
Reviews SPF, DKIM, DMARC and MX records and flags misconfigurations.
Spam risk alerts
Warns about sending behavior or content that could trigger spam filters.
Daily tips and reports
Practical guidance and detailed reports on deliverability progress.
Template and industry warmup
On the Smart plan, warms up your real templates and uses industry-specific networks.
Why use lemwarm?
- Warming up new mailboxes lowers the chance that cold emails go to spam.
- It runs in the background, so there is little manual work after setup.
- Setup checks catch DNS mistakes that often hurt deliverability.
- lemlist customers get it at no extra cost.
- The Smart plan warms up your real templates, not only generic messages.
Who is lemwarm best for?
A good fit for
- Cold email senders launching new domains or mailboxes
- Existing lemlist users who want built-in warmup
- Sales teams protecting the reputation of several inboxes
- Freelancers and solo founders starting outbound
Less suited to
- Teams that need a full outreach tool to send campaigns, unless paired with lemlist
- Users who need email list verification
- Senders whose outreach tool already includes unlimited warmup
lemwarm pricing
| Pricing model | Subscription |
|---|---|
| Free plan | No |
| Free trial | Not confirmed |
| Starting price | $29/month (Essential), lower with longer billing |
Essential is aimed at solo senders and Smart ($49/month) at teams, with quarterly billing saving 10% and yearly 20%. Custom pricing covers more than 10 users, and lemwarm is included free with every lemlist plan.
Prices checked October 2026. Vendors change plans often, so confirm on the official lemwarm pricing page before you buy.
lemwarm pros and cons
Pros
- Large warmup network across many domains and countries
- Built-in setup checks and spam risk alerts
- Included free with lemlist plans
- Template-based warmup on the Smart plan
Cons
- Warmup alone does not fix poor content or bad lists
- Standalone price adds up across many mailboxes
- Many cold email tools now bundle their own warmup
lemwarm integrations and platforms
Works with
Available on
lemwarm alternatives
See the full shortlist in Best Email Verification Tools.
lemwarm FAQ
Is lemwarm free?
lemwarm is not free as a standalone product. The Essential plan starts at $29 per month, with discounts for quarterly and yearly billing. However, lemwarm is included at no extra cost in every lemlist plan, so lemlist customers can use it without a separate subscription.
What is lemwarm used for?
lemwarm is used to warm up email inboxes before and during cold outreach. It sends and receives emails with a network of real mailboxes so providers see healthy activity, which helps your campaign emails reach the inbox. It also checks DNS setup and alerts you to spam risks.
Is lemwarm included with lemlist?
Yes. lemlist states that lemwarm and its built-in deliverability protections are included in all lemlist plans. Users who send campaigns through lemlist do not need to buy lemwarm separately. Senders who use a different outreach tool can still buy lemwarm on its own.
lemwarm vs Mailreach: what's the difference?
lemwarm and Mailreach are both email warmup tools that build sender reputation through automated email activity. lemwarm stands out for its tie-in with lemlist, its industry-specific networks and template warmup on the Smart plan. Mailreach is an independent warmup service. Pricing per mailbox and network quality are the main points to compare.
How long should I warm up an email with lemwarm?
lemwarm does not set one fixed period, since it lets you control the pace and keeps running in the background. Most senders keep warmup on for several weeks before sending cold campaigns from a new mailbox and leave it running afterward. Watch the deliverability score to judge when you are ready.
Sources
This overview is based on lemwarm's official website and documentation, checked October 2026.