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About

Where are your emails delivered? Receive reports with an in-depth understanding of what your emails are doing and how to increase your reputation and deliverability before you hit Send! In your reports you can: ❖ Check to see if your sending IPs or Domains are listed within 50+ major email blacklists. ❖ Protect your identity by identifying, monitoring, and rejecting unauthenticated outgoing emails. ❖ Identify whether your email’s content or reputation is being flagged as Spam by all major B2B and B2C email marketing providers. ❖ Fix HTML errors and identify “risky” content before sending. ❖ Get instantly notified when issues occur by email, Slack, or Telegram. Want to speak with an expert? Book a 1-hour consulting call to get all your email marketing and deliverability questions answered. We also offer comprehensive Email Deliverability Audits with personalized recommendations for companies looking to maximize their revenue with email.

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.

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

Email professionals and email marketers that want an email testing and deliverability solution

Audience

Any comapny who sends emails or manages email campaigns

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

Screenshots and Videos

No images available

Pricing

$9 per month
Personal accounts are FREE. Uptime Monitor Basic accounts start as low as $9 /mo. Save 25% on all annual subscriptions.
Free Version
Free Trial

Pricing

$49/month
Free Version
Free Trial

Reviews/Ratings

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

Reviews/Ratings

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

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Pros & Cons from Real Users

Pros

  • The best tools for cold email marketing. I also use recommendations for conducting email marketing, monitoring email deliverability, and checking my domain. Also, I installed the control and run the DMARC test.
  • - Easy to Use & Affordable Email Spam Test Reports - Action Steps on Email Spam Test Reports are easy for any marketer to follow (without extensive email authentication/IT knowledge) - Deliverability Services (consulting)
  • We send a high volume of emails, GlockApps lets us test deliverability so that we can optimize our sends so that they actually get delivered and opened by recipients. GlockApps provides very granular data on what needs to be fixed or improved in order to be fully optimized.

Cons

  • Email deliverability and DMARC test. Checking IP addresses or domains for inclusion in e-mail blacklists.
  • - DMARC Analytics are a bit complicated for a layperson.
  • Haven't ran into any cons, been using GlockApps for years.

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

GlockApps
Founded: 2009
United States
glockapps.com/

Company Information

InboxStack
Founded: 2025
India
inboxstack.com

Alternatives

Alternatives

Everest

Everest

Validity

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

Email Marketing Features

A/B Testing
Artificial Intelligence
Auto-Responders
CAN SPAM Compliance
Customer Surveys
Drip Campaigns
Dynamic Content
Event Triggered Email
Image Library
Landing Pages/Web Forms
Mailing List Management
Mobile Optimized Emails
Reporting/Analytics
Subscriber Management
Template Management
WYSIWYG Email Editor

Email Testing Features

A/B Testing
Accessibility Testing
Deliverability Rates
DMARC Analytics
HTML Validation
Improvement Recommendations
IP Blacklist Checking
Pre-Send Email Testing
Preview Across Browsers & Devices
Reporting / Analytics
Sender Reputation Scoring
Spam Testing

Integrations

Gmail
Yahoo! Mail
Amazon SES
Mailchimp
Mailgun
Microsoft Outlook
SendGrid
Slack
SpamAssassin
Telegram

Integrations

Gmail
Yahoo! Mail
Amazon SES
Mailchimp
Mailgun
Microsoft Outlook
SendGrid
Slack
SpamAssassin
Telegram
Claim GlockApps and update features and information
Claim GlockApps and update features and information
Claim InboxStack and update features and information
Claim InboxStack and update features and information