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  • ZeroBounce vs. Warmup Inbox
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ZeroBounce vs. Warmup Inbox

Looking for the best email warmupⓘ service? Check out this email warmupⓘ tool comparison of ZeroBounce vs. Warmup Inbox to determine which platform offers the features your company requires.

Try Warmup
A woman in a yellow shirt looks at a laptop with her male coworker and sees an Overall Inbox Score of 85%.

ZeroBounce vs. Warmup Inbox email warmupⓘ comparison overview

Here’s a quick snapshot of features for both platforms, including supported inboxes, features, customization options, security, and customer support.

Warmup Inbox
SupportsZeroBounce-managed (automated) -
  • G-Suite
  • Office 365
  • Any inbox that supports SMTP
Self-managed (user sends the emails) -
  • Any inbox
Any inbox with SMTP
Account listings & daily limitsStarts 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.

Starts at:

75 messages per day

Replies to sent emails up to 25%

MethodsAutomated sending

OR

Self-managed sending option

Emails sent to privately owned seed email accounts

Automated sending using a customer network
Email content usedUser-provided email content for self-managed option

AI-generated content for ZeroBounce-managed option

User-provided email content or AI-generated content
Schedule sendingDeliver emails whenever you prefer with the self-managed Warmup optionPro plan and above
Multiple languagesNoPro plan and above
Reporting dashboardYesYes
Placement & category monitoringYesYes
Authentication alignment trackingYesYes
Customizable engagement rulesYesNo
Deliverability checks (check if emails land in spam or promotions)Yes, included with ZeroBounce ONE™ (Inbox Placement Test - includes testing for 20+ domains)Yes
Military-grade security and privacy complianceSOC 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 supportYesPro plan and above includes Priority Support
Cancel any timeYesYes
Supports

ZeroBounce

ZeroBounce-managed (automated) -
  • G-Suite
  • Office 365
  • Any inbox that supports SMTP
Self-managed (user sends the emails) -
  • Any inbox

Warmup Inbox

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.

Warmup Inbox

Starts at:

75 messages per day

Replies to sent emails up to 25%

Methods

ZeroBounce

Automated sending

OR

Self-managed sending option

Emails sent to privately owned seed email accounts

Warmup Inbox

Automated sending using a customer network
Email content used

ZeroBounce

User-provided email content for self-managed option

AI-generated content for ZeroBounce-managed option

Warmup Inbox

User-provided email content or AI-generated content
Schedule sending

ZeroBounce

Deliver emails whenever you prefer with the self-managed Warmup option

Warmup Inbox

Pro plan and above
Multiple languages

ZeroBounce

No

Warmup Inbox

Pro plan and above
Reporting dashboard

ZeroBounce

Yes

Warmup Inbox

Yes
Placement & category monitoring

ZeroBounce

Yes

Warmup Inbox

Yes
Authentication alignment tracking

ZeroBounce

Yes

Warmup Inbox

Yes
Customizable engagement rules

ZeroBounce

Yes

Warmup Inbox

No
Deliverability checks (check if emails land in spam or promotions)

ZeroBounce

Yes, included with ZeroBounce ONE™ (Inbox Placement Test - includes testing for 20+ domains)

Warmup Inbox

Yes
Military-grade security and privacy compliance

ZeroBounce

SOC 2 Type 2 certification
ISO-27001 certification
GDPR, CCPA, HIPAA, and PCI compliance

Warmup Inbox

Compliance with GDPR and other relevant data protection laws
24/7 customer support

ZeroBounce

Yes

Warmup Inbox

Pro plan and above includes Priority Support
Does it require IMAP?

ZeroBounce

No, ZeroBounce only sends emails. It doesn’t read any of them to protect your confidentiality.

Warmup Inbox

Cancel any time

ZeroBounce

Yes

Warmup Inbox

Yes

Latest comparison as of January 2025

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.

Email scheduling

Most email warmupⓘ tools use AI to intelligently determine the best times to send emails from your account. However, advanced users may want greater control over the process.

Here’s how ZeroBounce compares to Warmup Inbox for this feature:

ZeroBounce Logo

Warmup includes a self-managed option. By choosing this, you’ll be given a list of seed email addresses. You can then send your real email campaigns and templates to these addresses at your normal or preferred time. Scheduling is entirely in your control.

Warmup Inbox

For basic users, Warmup Inbox automates the email warmupⓘ process, including scheduling, for you. However, if you upgrade to their Pro plan or higher, you’ll receive greater customization options in terms of how you send emails.

Email scheduling

Most email warmupⓘ tools use AI to intelligently determine the best times to send emails from your account. However, advanced users may want greater control over the process.

Here’s how ZeroBounce compares to Warmup Inbox for this feature:

ZeroBounce Logo

Warmup includes a self-managed option. By choosing this, you’ll be given a list of seed email addresses. You can then send your real email campaigns and templates to these addresses at your normal or preferred time. Scheduling is entirely in your control.

Warmup Inbox

For basic users, Warmup Inbox automates the email warmupⓘ process, including scheduling, for you. However, if you upgrade to their Pro plan or higher, you’ll receive greater customization options in terms of how you send emails.

Warmup reporting dashboard

For the best email warmupⓘ service, you need a comprehensive reporting dashboard that tracks your domain improvements.

Compare Warmup Inbox and ZeroBounce’s reporting features below:

ZeroBounce Logo

ZeroBounce ImageOverall inbox score (percentage of emails in the inbox vs. other folders)

ZeroBounce ImageLifetime inbox score improvement

ZeroBounce ImageSummary of today’s Warmup activity and last run

ZeroBounce ImageTracks where every email you send lands (inbox, promotions, or spam

ZeroBounce ImageTrack emails sent today

ZeroBounce ImageAll-time Warmup summary

ZeroBounce ImageCustomizable reporting & date adjustment

ZeroBounce ImageEmail authenticationⓘ alignment tracker for SPF, DKIM, and DMARC

Also included in your toolkit package featuring Warmup

ZeroBounce ImageBlacklist monitoring

ZeroBounce ImageDMARC monitoring

Warmup Inbox

ZeroBounce ImageSender reputation monitoring

ZeroBounce ImageBlacklist monitoring

ZeroBounce ImageTrack which emails go to inbox and go to spam

ZeroBounce ImageAlerts when your score drops below a certain point

Customizable engagement rules

Warmup Inbox provides a straightforward email warmupⓘ process by automatically handling it. This includes tracking your reputation and adjusting your sending activity based on performance. If your score dips below a certain point, it will alert you so that you can manually pause.

However, if you’re interested in Warmup Inbox alternatives with a bit more customization for different use cases, consider ZeroBounce’s Warmup features:

Select from a variety of sending and engagement patterns: Slower pace, domain repair, reputation boost, and protection. You can customize your warmup process based on the age of your domain, your current reputation, and how you want to strategize.

Adjust your rules as needed: While it’s recommended to use the ZeroBounce-managed method and allow the warmup process to proceed naturally, advanced users can adjust rules at any time.

Warmup reporting dashboard

Email warmup is all about enhancing your email deliverability. But you may be curious if your email content is successfully reaching the inbox now or going straight to spam. That’s when you need a way to test your email address deliverability as it stands now.

Let’s look at ZeroBounce vs. Warmup Inbox for deliverability checks:

ZeroBounce Logo

ZeroBounce ImageInbox Placement Tester is included with your toolkit

ZeroBounce ImageCheck your email campaign against 20+ well-known mailbox providers

ZeroBounce ImageFind out if your email goes to the inbox, spam, or promotions

ZeroBounce ImageGet a diagnosis of errors and how to fix them

Warmup Inbox

ZeroBounce ImageFeatures a free placement tester with publicly available addresses

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.

Security & compliance

Your business’s security and privacy is paramount. If you trust a service with your data, you need to know which accreditations, practices, and protocols are in place to secure your account.

ZeroBounce uses military-grade security and encryption. Specifically for Warmup, your emails will only be sent and shared with a list of seed email accounts owned and used by ZeroBounce. Your data is never exposed to another user.

ZeroBounce Logo
  • soc2
  • iso
  • hipaa
  • gdpr
  • privacy shield
  • ccpa

Check out our full security details

Warmup Inbox

ZeroBounce ImageWarmup Inbox’s specific security practices are undisclosed. However, they are compliant with GDPR and other data protection regulations.

Use case scenarios

With a detailed email warmupⓘ tool comparison complete, here’s the critical question:

Who benefits from using an email warmupⓘ tool?

Every business benefits from email warmupⓘ, especially when you have a wide variety of persons and teams sending emails using the same domain and IP address. Let’s take a closer look.

Sales and outreach professionals

When developing Warmup, we reached out to a variety of professionals.

It's no surprise that email marketers were familiar with email warmups. And, of course, they always use the best practices.

However, people on the sales side typically don’t think in terms of email deliverability. Your sole focus is on growing your numbers and making the most out of that new lead list.

However, here’s the usual result:

  • Many of those email addresses are invalid, which causes high bounce rates
  • People who haven’t opted into your message report you as spam
  • Your email engagement is poor when compared to the sending volume
  • Your sender reputation declines, which impacts EVERYONE at your company looking to generate revenue with email

It’s also vital to communicate that email warmupⓘ isn’t meant to aid bad actors. If you’re guilty of these actions, you still need to clean your data and follow best practices. However, even lawful senders can acquire many spam complaints from abusers, so email warmupⓘ is always in your best interests.

Here’s the TLDR:

  • If you’re regularly adding hundreds (even thousands) of leads to your database
  • If you’re not validating those email addresses
  • If you’re experiencing high bounce rates
  • If you’re not getting the engagement you want

You need to warm up your email reputationⓘ to prevent further damage.

Warm up new business domains

Email warmupⓘ doesn’t just help with reputation damage; it actively builds your reputation in all cases. This process is particularly useful if you’re starting a new business or creating a new domain that hasn’t sent mass email communications before.

Every business and email domain has a sender reputation. Think of this like a credit score for your email activity. While you may not have bad credit, not having any credit also makes other parties less trusting of you. But as a new business, you need to leverage email communications to start generating revenue.

The TLDR - use email warm up if:

  • You just started a new business
  • You switched to a new email domain
  • You’re rapidly scaling the amount of emails you send to subscribers

Use email warmupⓘ if:

  • You’re looking to improve your email campaigns and drive more engagement
  • You want to maximize your inbox visibility and stay out of spam
  • You have other team members and departments that aren’t following best sending practices

Frequently asked questions

Warmup Inbox pricing begins at $19/month for one inbox, which includes up to 75 email warmup messages daily. If you wish to warm up more inboxes, you’ll need to pay for additional plans. If you require more email messages, you’ll need to upgrade to a higher subscription tier.

ZeroBounce Logo