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.
Here’s a quick snapshot of features for both platforms, including supported inboxes, features, customization options, security, and customer support.
| Warmup Inbox | ||
|---|---|---|
| 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. | Starts at: 75 messages per day Replies to sent emails up to 25% |
| Methods | Automated sending OR Self-managed sending option Emails sent to privately owned seed email accounts | Automated sending using a customer network |
| Email content used | User-provided email content for self-managed option AI-generated content for ZeroBounce-managed option | User-provided email content or AI-generated content |
| Schedule sending | Deliver emails whenever you prefer with the self-managed Warmup option |
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:
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:
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.
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.
Warmup Inbox
Warmup Inbox’s specific security practices are undisclosed. However, they are compliant with GDPR and other data protection regulations.
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 Your sole focus is on growing your numbers and making the most out of that new lead list.
However, here’s the usual result:
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 is always in your best interests.
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.
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:
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
Also included in your toolkit package featuring Warmup
Blacklist monitoring
DMARC monitoring
Warmup Inbox
Sender reputation monitoring
Blacklist monitoring
Track which emails go to inbox and go to spam
Alerts 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:
Inbox Placement Tester is included with your toolkit
Check your email campaign against 20+ well-known mailbox providers
Find out if your email goes to the inbox, spam, or promotions
Get a diagnosis of errors and how to fix them
Warmup Inbox
Features 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.
Here’s the TLDR:
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:
Use email warmup if:
| Pro plan and above |
| Multiple languages | No | Pro plan and above |
| Reporting dashboard | Yes | Yes |
| Placement & category monitoring | Yes | Yes |
| Authentication alignment tracking | Yes | Yes |
| Customizable engagement rules | Yes | No |
| 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 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 | Pro plan and above includes Priority Support |
| Cancel any time | Yes | Yes |
| Supports |
ZeroBounce ZeroBounce-managed (automated) -
|
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 sendingOR 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 optionAI-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 certificationISO-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.
