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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

TrulyInbox’s warm-up sends emails like a real human, one at a time and at varying intervals for natural interaction with your inbox for a high Sender’s Reputation. You can increase your email frequency gradually as your Sender’s Reputation improves, helping to ensure that your emails land in the right inbox and avoid being marked as spam. TrulyInbox’s deliverability score lets you track your inbox reputation and deliverability rate, allowing you to keep an eye on your sending pattern. Anyone who sends cold emails for a wide range of use cases, such as marketing, and lead generation purposes. Outreach specialists, recruiters, marketers, salespeople, etc can benefit from email warm-ups.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Any comapny who sends emails or manages email campaigns

Audience

Anyone in need of an Email Warmup tool that interacts with their inbox to improve sender's reputation

Support

Phone Support Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

$49/month
Free Version Not Supported
Free Trial Supported

Pricing

Free
Free Version Supported
Free Trial Not Supported

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:

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Reviews/Ratings

Overall 1.0 / 5
ease 1.0 / 5
features 1.0 / 5
design 1.0 / 5
support 1.0 / 5

Pros & Cons from Real Users

Pros

  • None. There is nothing I liked working with this company. Their interface is poor, no support, no reporting. Nothing.

Cons

  • 1. Support is totally non-existent. I wrote their support the first time the 18th of June '25 and still have not receive ANY reply 2. When I bought Saleshandy (doing false advertising claiming 'unlimited warm' which you don't get) they told me that the existing TrulyInbox subscription would be cancelled and I would get linked with their system. That was a lie and the subscription did not get cancelled. And again support is not responding for a refund. 3. Connection to random inboxes is lost and neither their system or support helps to solve it 4. They don't show stats of emails send for warm-up. Only from yesterday but not over time. 5. their system does not adhere to the 'daily increase' of warm-up as per config at all

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Supported

Training

Documentation Not Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

InboxStack
Founded: 2025
India
inboxstack.com

Company Information

TrulyInbox
www.trulyinbox.com

Alternatives

Alternatives

LiftInbox

LiftInbox

Unique Technologies

Categories

Categories

Email Warmup Supported

Integrations

Gmail Supported
Microsoft Outlook Supported
Yahoo! Mail Supported

Integrations

Gmail Supported
Microsoft Outlook Supported
Yahoo! Mail Not Supported
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Claim InboxStack and update features and information
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