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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

Warmup Inbox automatically raises your email sending reputation through our network of inboxes that talk to each other. The process of preparing an email address for general use or email outreach is commonly referred to as “Warming Up” an inbox, where you take a number of steps to ensure that an email address does not become deactivated, blacklisted, or automatically marked as spam when it begins to send outgoing messages to other recipients. This process is typically done with newly created email addresses but also benefits older email addresses who have been having issues with email deliverability, in that a noticeable portion of their outgoing mail is either landing in a spam folder or blocked entirely by an email server due to either being blacklisted or associated with a domain that has a poor reputation. Warming Up an email inbox essentially is recreating the way a typical person will use an email address.

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

Businesses looking for an email deliverability solution

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

$19 per inbox 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 5.0 / 5
ease 4.7 / 5
features 4.7 / 5
design 4.7 / 5
support 5.0 / 5

Pros & Cons from Real Users

Pros

  • Easy to use and effective in warming up email accounts. We use a few different emails and they all work better with Warmup Inbox.
  • -Improved Email Deliverability -Automations -Provides detailed analytics -Great customer support -User-friendly
  • WarmupInbox really improved my domain reputation with several ESP. I tested with several custom ramp-up frequencies and the independent tools I use to monitor my domain health showed improvements.

Cons

  • Cost can get high if you use multiple Pro accounts.
  • -Occasional bugs: Even though the filter has been setup, sometimes the warmup emails still go straight to our inbox
  • First time setup wasn't the most simple but once you've done it once, it's very easy to use.

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

InboxStack
Founded: 2025
India
inboxstack.com

Company Information

Warmup Inbox
www.warmupinbox.com

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
Amazon SES
Google Workspace
Mailgun
Microsoft 365
SMTP Provider
SendGrid
SendPost
Zoho Mail

Integrations

Gmail
Microsoft Outlook
Yahoo! Mail
Amazon SES
Google Workspace
Mailgun
Microsoft 365
SMTP Provider
SendGrid
SendPost
Zoho Mail
Claim InboxStack and update features and information
Claim InboxStack and update features and information
Claim Warmup Inbox and update features and information
Claim Warmup Inbox and update features and information