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About

InboxStack is an email deliverability intelligence platform built around Brain, a proprietary causal AI engine that identifies why emails miss the inbox — not just that they did. Most deliverability tools stop at monitoring: they show a drop in inbox placement or a blocklist hit and leave you to investigate. InboxStack goes further, correlating signals from your ESP, DNS authentication records (SPF, DKIM, DMARC), Google Postmaster Tools, Microsoft SNDS, and 50+ blocklists through a causal knowledge graph built on a 22-year deliverability knowledge base — tracing the actual root cause, whether it's a DKIM misalignment, IP reputation dip, or content trigger. Onboarding starts with forwarding your email headers for an instant DNS/auth audit, no migration required. Teams that want ongoing monitoring can connect their ESP and Postmaster accounts, with optional seed testing for real inbox-vs-spam placement data. Built especially for digital agencies and ESP's.

About

Warmy.io is a tool designed to enhance email deliverability by raising your email reputation to ensure your emails avoid the spam folder. The platform offers automated warm-up with the help of "Adeline", their AI engine. Users can connect their mailbox and let the system warm it up at an optimal pace, analyzing hundreds of parameters daily, interacting with real people on your behalf, and ensuring your emails reach the inbox. Additionally, emails sent through Warmy.io are automatically opened, marked as important, and taken out of the spam folder, boosting the sender's reputation. The platform provides a clear and transparent process, allowing users to stay informed and in control with tools like the Email Deliverability Checker, Email Health Checker, and Email Template Checker. The website showcases testimonials from satisfied customers and offers a 7-day trial without the need for a credit card.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Any comapny who sends emails or manages email campaigns

Audience

Email deliverability platform for companies

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

$49/month
Free Version
Free Trial

Pricing

$49 per mailbox per month
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

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Reviews/Ratings

Overall 4.9 / 5
ease 5.0 / 5
features 4.9 / 5
design 4.6 / 5
support 5.0 / 5

Pros & Cons from Real Users

Pros

  • Reaching customers has been challenging due to our numerous email deliverability problems. Warmy made these problems easier for us to find and resolve. The product delivers. Delivery of emails increased significantly for us, and it's wonderful not to have to worry about spam folders.
  • Simple interface and detailed reports. simplifies DMARC setup, improving email authentication. Useful tool.
  • Really improves email reliability by verifying the authenticity of the sender. The benefit of the generator is that it helps prevent phishing by ensuring email integrity
  • The technical support was excellent, the guys helped set up all the necessary authentication settings. The bugs have been fixed. Separately, we note the email deliverability test. Very useful!
  • Easy to use interface; instantly generates SPF records to improve email security. Useful if you don’t know how to do it correctly and independently.

Cons

  • We have had no problems using Warmy's; they have been fantastic. Especially support team.
  • We didn't find any cons. This is a free tool, well designed, so we don’t see any downsides.
  • The main disadvantage may be ignorance of the technical features of DMARC policy
  • We haven't found any cons yet. The tool works well, and after just 3 weeks our deliverability rate began to increase.
  • Implementation may require some knowledge of DNS; a basic guide to advanced SPF options.

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

InboxStack
Founded: 2025
India
inboxstack.com

Company Information

Warmy
Founded: 2020
Israel
www.warmy.io

Alternatives

Alternatives

LiftInbox

LiftInbox

Unique Technologies

Categories

Categories

Email Deliverability Features

Deliverability Alerts
Deliverability Reporting
DMARC Analytics
Email Address Verification
Email Content Testing
Email Previewing
Inbox Placement Testing
IP Blacklist Monitoring
Reputation Reporting

Integrations

Gmail
Microsoft Outlook
Yahoo! Mail
AOL Mail
Amazon SES
Brevo
Google Workspace
Mailgun
Microsoft 365
SendGrid
Zoho Mail
iCloud

Integrations

Gmail
Microsoft Outlook
Yahoo! Mail
AOL Mail
Amazon SES
Brevo
Google Workspace
Mailgun
Microsoft 365
SendGrid
Zoho Mail
iCloud
Claim InboxStack and update features and information
Claim InboxStack and update features and information
Claim Warmy and update features and information
Claim Warmy and update features and information