The platform is easy to use, very intuitive, and we've had EXCELLENT support from our account rep David. He helped us through our transition from a shared IP to a dedicated IP, in conjunction with a major company rebrand, and the addition of new sending subdomains. With his guidance and expertise, it went more smoothly than I could have possibly imagined. The reports are insightful and clear. We're beyond pleased with the service we've received, and I'd consider Inbox Monster a must-have addition for providing peace of mind when it comes to something as critical as deliverability. Review collected by and hosted on G2.com.

Have not found anything to dislike. It's been a great product for us. Review collected by and hosted on G2.com.

We have the opportunity to work with InboxMonster, and I can confidently say their service has been nothing short of outstanding. From the outset, their team, specially Anna Kotlikov, demonstrated a level of professionalism, expertise, and commitment that exceeded our expectations.

What truly sets InboxMonster apart is their deep understanding of the email ecosystem. They provide clear insights, actionable data, and strategic recommendations that help us improve inbox placement, monitor our sender reputation, and optimize our deliverability practices. Every interaction with their team was thoughtful and results-driven.

Their platform is powerful yet intuitive, giving us the transparency we need to make informed decisions quickly. The support team is highly responsive, knowledgeable, and genuinely invested in our success — it felt more like a partnership than a vendor relationship.

InboxMonster's dedication to excellence, attention to detail, and proactive communication made a measurable impact on our email program. I would wholeheartedly recommend their services to any organization looking to take email deliverability to the next level. Review collected by and hosted on G2.com.

One potential area for improvement would be the addition of benchmarking tools or industry comparison data within the platform. While InboxMonster offers robust visibility into our own deliverability and performance, having the ability to measure results against industry standards or peer groups would add helpful context, especially when reporting to stakeholders. This isn’t a limitation by any means, but rather an opportunity to add even more strategic value for users. Review collected by and hosted on G2.com.

I'm newer to the email team that utilizes InboxMonster but from what I've gathered from my coworker who has worked with Josie and InboxMonster for over a year, Josie was instrumental in providing actionable insights to enhance deliverability. Review collected by and hosted on G2.com.

We don't have a proper CRM tool to leverage so InboxMonster isn't as much a problem as the tool we're using for email. Review collected by and hosted on G2.com.

I've been in the deliverability space for over a decade and have used all of the major players, including ReturnPath (now Validity) & SparkPost (now MessageBird) - and we've always found ourselves back at Inbox Monster. The application is intuitive, the reports generated are useful and actionable...but what makes Inbox Monster top is the team of experts working behind the scenes. Their knowledge of the best practices, ESP policies, and reputation recovery is above most in the industry. Review collected by and hosted on G2.com.

Seed list data outages were a regular occurrence in 2025. Although each instance was resolved in less than a week - still hurts to lose that data. Review collected by and hosted on G2.com.

Navigating diverse markets across multiple countries and industries has made it increasingly challenging to connect with customers. Inbox Monster’s platform empowers us to proactively monitor deliverability and identify potential risks before they escalate into client-impacting issues.

Beyond the platform, the true standout is their exceptional service. Brad is a phenomenal partner. His deep expertise and quick responsiveness have been instrumental in helping us navigate ISP challenges. His support has given our clients greater confidence in the success and stability of their email campaigns. Review collected by and hosted on G2.com.

Nothing. Inbox Monster meets the demands of our clients. Review collected by and hosted on G2.com.

Inbox Monster provides a lot of valuable insights into how are email deliverability is across many different email service providers. Review collected by and hosted on G2.com.

Inbox Monster has many features and data sets, but not all of the data feels immediately actionable and I don't understand what every feature does. Review collected by and hosted on G2.com.

As an early customer of Inbox Monster I have had the privilege of watching them grow. Their updates are always timely and relevant. I look forward to our continued partnership Review collected by and hosted on G2.com.

When I started their offering may not has been as robust as other providers but they have made continual improvements based on regular feedback from their users. Review collected by and hosted on G2.com.

Inbox Monster has been a life saver for our email program. We have worked with Josie for just under a year, but the amount of dedication and support she provided to analyze our deliverability, help us come up with an action plan to remediate our poor deliverability and sender reputation, and ongoing monitoring of trends after working through our issues, has played a significant role in the health and success of our email marketing.

Josie is always quick to respond and will walk through the issues with us, giving us valuable insights and recommendations along the way. My team does not have a strong background in deliverability, but Josie and the Inbox Monster team, has made a very technical part of email marketing very easy to understand and action against, allowing us to grow our skillset while also educating the rest of the company on deliverability best practices to ensure we do not fall into the same mess that we worked so hard to pull ourselves out of.

In October 2024, we found out, with the help of Inbox Monster, that our inbox rate with Gmail was at 1% with low sender reputation. After working with Josie, we were able to increase and maintain our Gmail inbox rate to 95-100% with high sender reputation within 4 months. I cannot recommend Inbox Monster enough. Review collected by and hosted on G2.com.

Email deliverability is overwhelming. This is not an Inbox Monster issue. The team at Inbox Monster is incredibly knowledgeable and gives so much information. A lot of the time, the analysis is easy to follow while meeting with the Inbox Monster team, but the amount of numbers and tabs within the platform make it a little difficult to follow on our own. We have a wonderful support team who are willing to meet at our cadence to discuss, but it's a bit difficult to do our own analysis outside of those meetings. Review collected by and hosted on G2.com.

The toolset is very robust and they are consistently adding to the functionality. The account support has also been great and incredibly proactive. Thom is the best and always super helpful. Review collected by and hosted on G2.com.

Right now, there is nothing currently that I do not like or appreciate about Inbox Monster. Review collected by and hosted on G2.com.

I love the support I get from the team. They are responsive and resourceful. IM helped bring my company from being blocklisted to having a high sender reputation again. Forever grateful! The platform is very easy to understand and use. Integration was easy and our account rep is supportive. My team gains a lot of insight from the platform. I am in the platform multiple times a week monitoring campaign performance. Review collected by and hosted on G2.com.

I wish it offered list-cleaning services. I also think the seedlist logic has implicit biases so although I trust IM inbox placement results, I still take the results as directional. I may just not have a full understanding on how the seedlist logic works. I will work with my IM analyst on this to get a better understanding.

Implementation is a little tough when it comes to monitoring deliverability for journeys. We have so many journey's set up and our emails are always changing, so having to built automations that monitor deliverability for all of our journey's is a bit challenging. Review collected by and hosted on G2.com.