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InboxMonster review

InboxMonster offers robust email deliverability and creative testing, often complemented by hands-on support.
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Product functionality

Feature set

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InboxMonster brings a comprehensive suite of tools designed to tackle a wide array of email and SMS deliverability challenges. Their platform focuses heavily on pre-send workflows, device rendering, and real-time monitoring. We found its capabilities for creative proofing, accessibility analysis, and device previews to be quite strong, giving us good visibility into how emails appear across different clients.
Beyond creative aspects, InboxMonster provides weighted inbox placement, detailed spam trap and blocklist (or blacklist) monitoring, and reputation analysis. It also includes DMARC monitoring, though this is often integrated as part of a broader deliverability package. We noted a particular strength in their "beacons" feature, which allows for monitoring competitor email programs, and robust reporting for understanding email performance across various service providers.
How easy is this product to use

User experience

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Our experience with InboxMonster's user interface revealed a platform that is generally straightforward, but with a noticeable learning curve due to its extensive feature set. While initial setup and core functions are accessible, delving into the more intricate data sets and advanced features requires time to understand fully. The dashboard provides a wealth of information, which can be both a blessing and a curse for those not deeply immersed in email deliverability metrics.
Despite the initial complexity, we found that regular use and engagement with their support team made navigating the platform much easier. The ability to share reports is a plus, facilitating collaboration within teams. We observed that while the platform aims for intuitive design, the sheer volume of data and the depth of analysis available might overwhelm users who prefer a more streamlined experience without extensive training.
How good is the support

Support

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One of InboxMonster's most frequently highlighted strengths is its customer support. We consistently found their team to be highly responsive, knowledgeable, and proactive in addressing deliverability challenges. They offer what is often described as a "white glove setup" and dedicated account managers who provide actionable insights and recommendations.
Their support extends beyond just platform assistance, with consultants leveraging existing relationships with internet service providers to troubleshoot and resolve inboxing issues, which can save a significant amount of time. This level of personalized, hands-on support is a substantial advantage, especially for teams that may not have deep in-house deliverability expertise, or for businesses that rely heavily on prompt issue resolution.
Who should use this product

Suitability

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InboxMonster is particularly well-suited for mid-market to enterprise-level organizations that prioritize comprehensive deliverability and creative pre-send testing, and are willing to invest in a premium solution with dedicated support. Companies with complex email programs, multiple sending IPs, and a high volume of email and SMS campaigns would benefit most from its detailed insights and proactive monitoring.
For Managed Service Providers (MSPs), InboxMonster can serve as a powerful tool to manage multiple clients' deliverability needs, especially given its advanced reporting and hands-on consulting. Small to medium-sized businesses (SMBs) might find the comprehensive feature set and associated pricing to be more than what they require, unless they have very specific, high-stakes deliverability challenges where the investment is justified.

InboxMonster feature set

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DMARC report analysis
Source detection
Forward detection
Spoof detection
Notifications and alerts
Reporting
API
Mentioned as a future rollout, not yet available.
Multi-tenancy
SPF flattening
Hosted DMARC
Blocklists and reputation
AI copilot
DNS monitoring
Self hostable
Free trial/free tier

Drawbacks and what to watch out for

While InboxMonster offers a robust set of features and excellent support, some drawbacks emerged during our review. The platform can present a steep learning curve, making it challenging for users to perform their own in-depth analysis without consistent guidance from the support team. Furthermore, the pricing structure, particularly the additional cost for certain tools, might be a significant consideration for some organizations.
We have pulled the average ratings from G2 for InboxMonster, and also included the most recent negative reviews for InboxMonster in full. Positive reviews tend to have less detail and have a higher chance of being fraudulent, so negative reviews are a better signal for your decision.
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InboxMonster
Josie + InboxMonster has helped our email team tremendously!
What do you like best about Inbox Monster? 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. What do you dislike about Inbox Monster? 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. What problems is Inbox Monster solving and how is that benefiting you? At the beginning of the year, the team discussed solutions such as better domain/IP allocation, stricter demark policies, and monitoring iCloud; they also noted the impact of email frequency and rogue franchisees on complaint rates. Next steps included investigating unsubscribe inconsistencies, exploring click activity data, discussing IP address optimization, and a future demo of Inbox Monster's "Creative Projects" tool; Josie Garcia will also provide further ISP and deliverability information. Most recently, Josie shared SendGrid-specific recommendations, best practices, and provided platform training, including user management, notifications, campaign tagging, subscriber insights, and spam trap analysis.
Verified User in Maritime
Small-Business (50 or fewer emp.)
InboxMonster
Great toolset and helpful account support
What do you like best about Inbox Monster? 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. What do you dislike about Inbox Monster? Right now, there is nothing currently that I do not like or appreciate about Inbox Monster. What problems is Inbox Monster solving and how is that benefiting you? Inbox Monster is helping us manage and get insight into deliverability problems when they arise. There is a great toolset that is built behind this management and the additional tools with respect to content rendering is super helpful.
Verified User in Publishing
Mid-Market (51-1000 emp.)
InboxMonster
Valuable Deliverability Insights
What do you like best about Inbox Monster? Inbox Monster provides a lot of valuable insights into how are email deliverability is across many different email service providers. What do you dislike about Inbox Monster? 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. What problems is Inbox Monster solving and how is that benefiting you? Before Inbox Monster, we couldn't see where our emails were landing or what seeds were having deliverability issues.
Verified User in Higher Education
Mid-Market (51-1000 emp.)
InboxMonster
A Game-Changer for Email Deliverability
What do you like best about Inbox Monster? 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. What do you dislike about Inbox Monster? 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. What problems is Inbox Monster solving and how is that benefiting you? Inbox Monster helps provide valuable insight to our email deliverability and sender reputation.
Verified User in Health, Wellness and Fitness
Enterprise (> 1000 emp.)
InboxMonster
Great tool with excellent consulting support
What do you like best about Inbox Monster? Clear reporting to understand our deliverability/inboxing, as well as domain/IP reputation factors. And the consulting services offered save us a ton of time, as they leverage existing relationships with email providers to troubleshoot/address inboxing issues. Super easy to use and onboard as well. What do you dislike about Inbox Monster? Everything is worth it, but the tool costs more than other deliverability platforms, however, that's largely because they are taking on the work of coordinating with email providers What problems is Inbox Monster solving and how is that benefiting you? They offer a one-stop shop of crucial information to understand our sending domain/ip health, and most importantly, offer services that help us work with email providers quickly and effectively. This saves our team a ton of time we would otherwise have to spend coordinating with each ESP
Brandon G.
Senior Manager, Marketing Operations Mid-Market (51-1000 emp.)
InboxMonster
Great Deliverability Tools with Hands On Support
What do you like best about Inbox Monster? Easy to use, comprehensive deliverability tools that give tons of insight on how emails are landing. Their account reps are fantastic resources for improving inbox placement as well. What do you dislike about Inbox Monster? There are a lot of add ons that have been introduced more recently that are a bit out of scope of deliverability and would add to the already high cost of the platform. What problems is Inbox Monster solving and how is that benefiting you? Inbox Monster gives valuable insights on how your emails are landing which provides an opportunity for us to optimize our sending practices, increase domain reputation, and in the end see higher revenue created from more emails successfully delivered.
Kelley S.
Director of Integrative Marketing Mid-Market (51-1000 emp.)

Pricing

InboxMonster generally targets mid-market to enterprise clients with a premium pricing model, while Suped offers a more accessible entry point with a generous free plan, scaling up to enterprise solutions.
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Small
Contact for pricing (Creative Suite from $3,000 yearly)
Free
Medium
Contact for pricing (Deliverability Suite from $15,000 yearly)
$9/month
Large
Contact for pricing
$99/month
Enterprise
Contact for pricing
Contact for pricing

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What makes Suped different

Automated sender discovery that finds shadow IT and third-party services
DMARC copilot that pinpoints failures and prescribes the exact fix
Guided path to full p=reject enforcement, safely and quickly
Proactive alerts to prevent misconfigurations before they block your mail
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Frequently asked questions

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