Both lemwarm and ZeroBounce provide some of the best email warmup tools available. But let’s take a closer look at how each platform warms up inboxes and improves email deliverability.
Which mailboxes are supported by lemwarm and ZeroBounce?
ZeroBounce - Connect any mailbox that uses SMTP
Lemwarm - Connect any mailbox that uses SMTP
Like most email warmupⓘ tools, both platforms will allow you to connect any mailbox or email service provider (ESP) that supports SMTP. That qualifier includes the most popular ESPs, including G-Suite, Outlook, Yahoo, and others.
In addition, both ZeroBounce and lemwarm provide more direct account links to Gmail/G-Suite and Office 365/Outlook SSO.
Daily sending limits, email warmupⓘ actions, and account listings
Once your initial email warm-up setup is complete, both lemwarm and ZeroBounce begin an automated process that gradually builds the reputation of your attached mailbox. Both platforms achieve this by sending low volumes of emails and gradually increasing this number over time.
Let’s look at the limits provided by each platform based on their starting plans:
ZeroBounce ONE™
250 Warmup seeds
2 accounts/mailboxes
Includes AI-generated content based on your actual emails for the ZeroBounce-managed method. There is an option to use your actual email campaigns/templates with the Self-Managed method./mailboxes
Lemwarm
Basic Plan
1 email warmup
Features recommended sending limits based on your warmup account duration. Essential plan uses generalized content.
The main difference between Lemwarm and ZeroBounce is how usage is measured. Lemwarm bases its limits on the number of emails sent, while ZeroBounce counts one email per seed per day, with each of those emails including around five actions (such as opens, clicks, favorites, forwards, and marking emails as safe). Since these actions have a stronger influence on domain reputation than simply sending emails, ZeroBounce’s approach focuses on measurable actions rather than raw send volume.
However, lemwarm features no real sending limits and will provide guidelines on how many daily and weekly emails you should send based on your current progress.
Lastly, the type of content used in each platform’s email warm-up processes matters. It's critical to use emails that are personal to your company to ensure that your warm-up emails look and feel authentic.
To obtain personalized email content for use with lemwarm, you’ll need to upgrade to their Smart plan. Comparatively, ZeroBounce only uses your real email content or content generated to simulate your actual email style and patterns.
Important note about where your warm-up emails go
ZeroBounce owns all of its seed email addresses and does not send or share your email content with any other users.
Lemwarm
lemwarm completes your email warm-up process by sharing your warm-up emails with its community of users. Those messages are sent to other user domains and vice versa.
Email scheduling
To ensure the email warm-up process is as effective as possible, it’s recommended that the tool adjust email sending as necessary. Factors such as domain age, reputation, and certain deliverability risk factors can prompt the need to adjust sending volume over time.
Let’s compare lemwarm and ZeroBounce to see how they handle scheduling and recommended sending volume:
You can adjust your sending limits at any time. ZeroBounce will also auto-adjust your sending activity based on your current Warmup performance.
Regarding scheduling, you can manage all of your email warm-up activity by selecting the self-managed option. We’ll provide our list of seeds, and you can send your real email campaigns at your desired times, just like you would with a real email campaign.
Lemwarm
You can customize daily sending limits and increase the incremental volume at any time. You will also receive a notification of any issues that recommend a manual adjustment in your sending volume. However, you cannot adjust when those emails are sent.
ZeroBounce vs lemwarm: warmup reporting dashboards
lemwarm and ZeroBounce feature fully-featured email warmupⓘ reporting dashboards that provide specific details about your performance. This list of features includes the following:
Email deliverability checks for campaigns
As the email warm-up service progresses, you’ll still need to send your standard email campaigns to your audience. Based on your current warm-up progress, you’ll likely want to know where your email will land.
Here’s how lemwarm and ZeroBounce can help you in this area:
ZeroBounce ONE™ includes Warmup and five additional tools, including the Inbox Placement Tester.
This tool allows you to send your email campaign to 20+ different mail providers, including Google, Yahoo, and others, to determine how your campaign will perform. Each of these providers has their own way of analyzing processed emails as well as different anti-spam technologies. The Inbox Placement Test will tell you how your campaign performs with each of these providers so that you can adjust your campaign as needed.
Lemwarm
lemwarm provides a publicly available email deliverability test. This test uses a single email account found on the lemwarm domain and provides a technical check-up as well as a content check to see if your email triggers spam filters.
Does ZeroBounce have access to read my emails?
Any email warmupⓘ service will read the emails sent to the privately-owned seed email addresses, so that they can perform realistic, authentic behaviors.
However, ZeroBounce doesn’t read any emails found in the connected inbox. The company maintains strict adherence to security and privacy regulations to protect your data.
Whether you’re a small business or a global enterprise, your company’s security and your customers' privacy rights are paramount. As a result, security and privacy are top priorities for ZeroBounce.
Lemwarm
lemwarm’s exact security specifications are undisclosed. However, according to the Privacy Policy listed on their website, they are compliant with GDPR and other relevant data protection regulations.
Who can benefit from the best email warmupⓘ tools? Any business that sends emails, especially if you have other professionals outside of your marketing team using email for outreach.
Sales teams and outreach specialists
If you don’t know any better, your business is likely sending all of its emails from the same domain (the primary business domain). The problem with this is that everyone’s activity, including the bad practices, impacts your email deliverability. Unfortunately, those most commonly come from the non-marketers.
If you’re in sales or outreach, regularly add huge lists of new contacts without verifying them, and send a high volume of emails, you need email warm-up.
While it’s still critical to get everyone on board with best practices (cleaning new leads, sending from subdomains when applicable), an email warm-up service can mitigate the damage by generating consistent positive email engagement over time.
Warm up business domains and subdomains
To avoid email deliverability damage to your main business domain and try new things, create subdomains for your different teams and use cases.
However, new domains lack a reputation and need a way to get up to speed. You can achieve this by warming them up.
Email Warmupⓘ is an excellent way to help your team quickly set up new subdomains so that your sales, BDR, and cold outreach emails will actually reach prospects instead of going directly to spam.
Email marketers and marketing specialists
If you need a lemwarm alternative, look no further.
Try email warmupⓘ with ZeroBounce ONE™, your all-in-one solution for unbeatable email deliverability.
lemwarm is an email warmup service provided by lemlist that provides monthly domain reputation improvement for one account. Comparatively, ZeroBounce provides email warm-up as a part of its full email deliverability package, which includes essentials like DMARC, blacklist monitoring, and testing. Both platforms provide a fully automated email warm-up service.
Researching the best email warmupⓘ tools? Check out our lemwarm email warmupⓘ comparison with ZeroBounce to learn more about support, features, account limits, security, customer support, and more.
Reach out to our sales team now, and we’ll help set up the right package for you.
Here’s the quickest way to compare lemwarm and ZeroBounce. The table below provides a snapshot of each platform’s most up-to-date features. If you have questions regarding any of the areas below, scroll further down for a more detailed analysis.
 | lemwarm | |
|---|---|---|
| Supports | ZeroBounce-managed (automated) -
| Any inbox with SMTP |
| Account listings & daily limits | Starts at: 250 Warmup Seeds 2 Accounts Replies are dynamically based on engagement rules and can go up to 35% *A warmup seed can perform up to 5 actions per email from a single warmup account. These actions may include opens, clicks, favorites, replies, and similar interactions. | 1 account |
| Methods | Automated sending OR Self-managed sending option | Automated sending Emails sent to other lemwarm users |
| Email content used | User-provided email content for self-managed option AI-generated content for ZeroBounce-managed option | Essential Plan - Human-like email content Smart Plan - Personalized email content or provide your own templates |
| Schedule sending | Deliver emails whenever you prefer with the self-managed Warmup option | No |
| Multiple languages | No | No |
| Reporting dashboard | Yes | Yes |
| Placement & category monitoring | Yes | Yes |
| Authentication alignment tracking | Yes | Yes |
| Customizable engagement rules | Yes | Yes |
| Deliverability checks (check if emails land in spam or promotions) | Yes, included with ZeroBounce ONE™ (Inbox Placement Test - includes testing for 20+ domains) | Free tests available with a public lemwarm domain/email address |
| Military-grade security and privacy compliance | SOC 2 Type 2 certification ISO-27001 certification GDPR, CCPA, HIPAA, and PCI compliance | Compliance with GDPR and other relevant data protection laws |
| 24/7 customer support | Yes | No |
| Does it require IMAP? | No, ZeroBounce only sends emails. It doesn’t read any of them to protect your confidentiality. | Yes |
| Cancel any time | Yes | Yes |
| Supports |
ZeroBounce ZeroBounce-managed (automated) -
|
lemwarm Any inbox with SMTP |
| Account listings & daily limits |
ZeroBounce Starts at:250 Warmup Seeds 2 Accounts Replies are dynamically based on engagement rules and can go up to 35% *A warmup seed can perform up to 5 actions per email from a single warmup account. These actions may include opens, clicks, favorites, replies, and similar interactions. |
lemwarm 1 account |
| Methods |
ZeroBounce Automated sendingOR Self-managed sending option |
lemwarm Automated sendingEmails sent to other lemwarm users |
| Email content used |
ZeroBounce User-provided email content for self-managed optionAI-generated content for ZeroBounce-managed option |
lemwarm Essential Plan - Human-like email contentSmart Plan - Personalized email content or provide your own templates |
| Schedule sending |
ZeroBounce Deliver emails whenever you prefer with the self-managed Warmup option |
lemwarm No |
| Multiple languages |
ZeroBounce No |
lemwarm No |
| Reporting dashboard |
ZeroBounce Yes |
lemwarm Yes |
| Placement & category monitoring |
ZeroBounce Yes |
lemwarm Yes |
| Authentication alignment tracking |
ZeroBounce Yes |
lemwarm Yes |
| Customizable engagement rules |
ZeroBounce Yes |
lemwarm Yes |
| Deliverability checks (check if emails land in spam or promotions) |
ZeroBounce Yes, included with ZeroBounce ONE™ (Inbox Placement Test - includes testing for 20+ domains) |
lemwarm Free tests available with a public lemwarm domain/email address |
| Military-grade security and privacy compliance |
ZeroBounce SOC 2 Type 2 certificationISO-27001 certification GDPR, CCPA, HIPAA, and PCI compliance |
lemwarm Compliance with GDPR and other relevant data protection laws |
| 24/7 customer support |
ZeroBounce Yes |
lemwarm No |
| Does it require IMAP? |
ZeroBounce No, ZeroBounce only sends emails. It doesn’t read any of them to protect your confidentiality. |
lemwarm Yes |
| Cancel any time |
ZeroBounce Yes |
lemwarm Yes |
Latest comparison as of October 2024
Disclaimer: The third party's name is utilized for comparison purposes only and is the trademark of its respective owner. ZeroBounce claims no rights whatsoever in the use of such name and/or any related trademarks. ZeroBounce is not affiliated with the third party referenced on this page.
Overall inbox score (percentage of emails in the inbox vs. other folders)
Lifetime inbox score improvement
Summary of today’s Warmup activity and last run
Tracks where every email you send lands (inbox, promotions, or spam
Track emails sent today
All-time Warmup summary
Customizable reporting & date adjustment
Email authentication alignment tracker for SPF, DKIM, and DMARC
ZeroBounce ONE™ package
Blacklist monitoring
DMARC monitoring
Lemwarm
Your overall deliverability score
Personalized feedback and tips based on sending activity and current score
Your total sent emails
Total emails saved from spam
Categories for where each of your warmup emails land
DNS and alignment checks
You can also customize the reporting period at any time.
Customizable engagement rules
ZeroBounce and lemwarm allow you to adjust how you manage email warm-up at any time with minor differences.
During ZeroBounce’s initial Warmup setup, you’ll be able to choose from a list of recommended sending and engagement rules based on your desired goal (build reputation, repair, boost, etc.). These categories are recommendations that can be adjusted at any time based on your current performance. Warmup will also auto-adjust activity and send as needed.
Similarly, lemwarm provides recommendations regarding how many warmup emails you should send that day or for the week based on past activity and performance. You can adjust these numbers at any time.
Whether you opt for lemwarm, ZeroBounce, or any other lemwarm alternatives, email warm-up is now considered an essential part of the marketing and outreach process.
Even if you follow all of the best practices; validate your new leads, segment audiences, use different subdomains, and request users to opt-in, you’re still going to encounter problems. People will report you as spam for no reason, errors will cause emails to bounce, and more issues will arise that you’ll need to troubleshoot fast.
Continuously warming your email domain allows you to continue your email marketing program with peace of mind. The positive engagement you receive daily is a healthy counterbalance to the errors you may face and some of the unwarranted treatment you’ll get readers that you’re legally allowed to send to.
ZeroBounce ONE 
™
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