InboxStack
GlockApps
Email Testing By Inbox Pirates
Validity LLC
MxToolBox
HetrixTools
Inbox AI
InboxPro
Folderly
Loops.so
Mailwarm
Warmup Inbox
Warmy.io
Warmbox.ai
MailReach.co
Resend
InboxStack is an email deliverability intelligence platform built for teams who need to know why their emails aren't reaching the inbox โ not just that they aren't. At its core is Brain, a proprietary causal AI engine trained on a 22-year deliverability knowledge base, which correlates signals across your ESP, DNS authentication records (SPF, DKIM, DMARC), Google Postmaster Tools, Microsoft SNDS, and 50+ blocklists to pinpoint root causes instead of surfacing raw metrics.
Most deliverability tools stop at monitoring: they show you a drop in inbox placement or a blocklist hit and leave you to investigate. InboxStack goes further, tracing the actual causal chain โ a DKIM misalignment, a reputation dip on a specific sending IP, a content trigger โ so you can fix the real problem instead of guessing.
Setup takes minutes with no migration required: forward your email headers for an instant DNS/authentication audit, or connect your existing ESP and Postmaster accounts for ongoing monitoring. Optional seed testing gives you real inbox-vs-spam placement data across major providers.
Built for agencies managing multiple client domains and growing companies who've outgrown basic authentication checkers, InboxStack turns deliverability from a black box into a diagnosable, fixable system.
Folderly is more than just an email deliverability tool.
Deep email deliverability fixes, technical setup, access to an up-to-date deliverability score, user-friendly template management, team accounts, and, now, spam trigger detection with best practices to followโall of these features assist you in reaching and maintaining 99.9% email deliverability.
Locate, solve, and prevent email deliverability pitfalls, and ensure your emails reach the Inbox folder. Never again let your emails be part of the 51% of all business emails that never reach the inbox. Make every email count, bringing in revenue and business opportunities.
How will you use Folderly?
Reach the recipients' Inbox. Folderlyโs advanced algorithms analyze your outbound email campaigns and identify issues that cause your emails to be filtered out of recipients' inboxes.
Increase delivery, reply, and conversion rates. We will identify the most pressing issues by analyzing your entire email ecosystem and suggest the simplest ways to address them.
Skyrocket revenue from email outreach. By delivering 100% of your emails, you can significantly boost your sender score, generate more leads, and ultimately increase your email channel's ROI.
InboxStack FolderlyFolderly is recommended for marketers, email campaign managers, and businesses that heavily depend on email as a primary communication tool, especially those who experience issues with emails being marked as spam. It is also suitable for businesses looking to optimize their outreach efforts and improve overall email deliverability rates.
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Our field of work requires extensive communication via email; therefore, we needed a solution that would monitor our email deliverability rate and help us eliminate any possible issues causing our emails to land in spam, if they arise. Folderly performs its job well and protects our email reputation. The team has helped us fine-tune our email infrastructure, and is overall very responsive - they always answer our questions in a timely and detailed manner.
With Folderly, we have a clear picture of the situation with our mailboxes, understand what exactly caused our emails to go to spam, and see our campaigns' performance getting better. The team is always ready to give us a helping hand and explain what we need to do next.
We thought our email campaign is doing good, but Folderly team boosted results to super cool! They are always there to help and give insightful advice. If you have troubles with spam and want to improve your email deliverability, Folderly would be your best choice ;-)
Based on our record, Folderly seems to be more popular. It has been mentiond 60 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Make โข Build and automate workflows InvoiceBerry โข Online invoicing for small businesses Gusto โข Payroll, benefits and HR management Hive โข Manage tasks, workflows and teamโs work Lanva โข Social video editing app. ClickUp โข Manage tasks, docs, chat, goals and more Plausible โข Open-source privacy-friendly web analytics Podcast Hawk โข Podcast guest booking software. Writesonic โข AI-driven content... Source: over 3 years ago
BTW, the same thing I noticed with emails. I recently started to work with them, and differentiating emails and sending them to the right group of people brings a more positive outcome. We recently checked it on https://folderly.com/. So, I think those things can be linked to each other. Source: almost 4 years ago
Finally, I would suggest you also use https://folderly.com/ in addition to those two email clients. I would help you avoid making your emails spammy and maintain a high email deliverability score. Itโs essential if youโre using email for business purposes. Source: almost 4 years ago
Besides, I recently noticed that Apple mail didnโt send my emails. I thought my clients didnโt receive my emails because they were in the spam folder. But, I checked my email deliverability on https://folderly.com/, and it was OK. So, Iโve been looking at what makes my clients not get my emails and discovered that this email client doesnโt send them for some reason. Source: almost 4 years ago
But, after testing my email campaign on my friends, I was left puzzled why my letters went to spam. I've read somewhere that you can run all your emails before launching the marketing campaign on https://folderly.com/. I did it, and my score wasn't the best, nor too low. I thought the reason might be in the attached PDF file and links to my store. Do you think that it might be the case? If yes, what are the... Source: almost 4 years ago
GlockApps - G-Lock Apps is an interesting tool that might seem simple to some, but is quite essential to most online marketers.
Loops.so - We bought a billboard in Times Square and we're letting you advertise your startup on it!It's free.
Email Testing By Inbox Pirates - Preview, Analyze & Test emails with one click.
Mailwarm - Email warmup tool to avoid spam folder, since 2020 - Backed by Email Deliverability Experts
Validity LLC - Founded in 2010, located in Essex Countyโs City of Orange, NJ, and serving all 50 states of the U.S., Validity, LLC is considered a โOne Stop Shopโ for ...
Warmup Inbox - Warmup Inbox is a tool that automates the process of warming up your email inboxes, raising your sender reputation and inbox health automatically.