lemwarm is an email warm-up tool that helps improve deliverability so your emails land in the inbox (not spam) by gradually building your sender reputation.
Before you begin
Make sure you have access to the inbox of the email address you want to warm up (to complete verification and provider connection steps).
For best results, your domain/email authentication should be correctly configured (SPF, DKIM, DMARC, MX, and a custom tracking domain).
Step 1: Complete your technical setup (recommended)
Before activating lemwarm, complete your email authentication setup to ensure proper email delivery:
SPF (Sender Policy Framework): Verifies that emails are sent from your domain. If you need help on setting it click here.
DKIM (DomainKeys Identified Mail): Ensures your emails aren’t altered after sending. Need help on the setup we go you check it out.
DMARC (Domain-based Message Authentication, Reporting & Conformance): Protects your domain from phishing. Check our guide on the setup.
MX Records (Mail Exchange Records): Identifies the servers that accept emails for your domain. You can find on this here.
Custom Tracking Domain: Enables tracking of open and click rates in your emails. For a step by step guide, click here.
For a quick authentication check, use our technical setup checker.
Step 2: Verify your email address
From your dashboard, go to Verify your email address, then follow the instructions in the verification email to activate your lemwarm account.
Step 3: Choose your plan
Click Choose a plan, then select the plan that matches your needs (you can choose the billing period and number of seats if applicable).
lemwarm offers two plans:
Essential Plan: Maintains your email reputation and monitors deliverability.
Smart Plan: Includes all Essential features plus Smart Content Emails and Smart Clusters to enhance deliverability with industry- and audience-based personalization.
Learn more about lemwarm plans here.
Step 4: Connect your email provider
Connect the email address you want to warm up (it can be different from your lemwarm login). Go to Settings > Sending settings, then click Connect email address and follow the provider setup guide to complete the connection.
Step 5: Adjust your warm-up settings and start lemwarm
Go to Warm up, set your Warm-up (emails/day) and Ramp-up increment, then click Start to begin sending and receiving warm-up emails.
Warm-up (emails/day): Your target daily limit once ramp-up is complete (recommended: 30 emails/day for accounts <6 months, 40 for older accounts).
Ramp-up increment: How many emails/day to increase during warm-up (recommended: 1 email/day for accounts <6 months, 2 emails/day for older accounts).
Example: If you set the ramp-up increment to 2, lemwarm will send 2 emails on Day 1, 4 emails on Day 2, 6 emails on Day 3, and so on until your daily limit is reached.
Typically, your email account will be fully warmed up within 3 to 5 weeks.
Troubleshooting: If you can’t start lemwarm
If lemwarm won’t start, go to DNS checks and confirm that your domain setup is complete (MX, SPF, DKIM, DMARC, and custom tracking domain). You can also click Refresh checks to re-run the tests.
How to track deliverability and warm-up progress
Use the Deliverability score dashboard to monitor your performance, including email placement, deliverability tips, and indicators that affect your sending reputation.
Your deliverability score typically falls into one of these stages:
Red: Risk of blacklisting; avoid sending campaigns.
Orange: Warming up; proceed with caution.
Green: Optimal deliverability; you can start sending emails.
How long should you keep lemwarm running?
Always. Keeping lemwarm active helps maintain and improve your sender reputation over time and reduces the risk of deliverability issues when you launch or scale campaigns.