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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

MailPilot is a web-based email warmup and deliverability platform for B2B sales teams, SDRs, founders, and cold-email agencies. It automates mailbox warmup and provides inbox-placement checks across major email providers, along with sender-reputation reporting and diagnostics for SPF, DKIM, DMARC, DNS, and blocklists. MailPilot also offers pre-send checks for spam signals and links, and can send alerts through connected communication channels. Users connect email accounts from supported providers or custom SMTP services to monitor mailbox health and prepare outreach campaigns. The service is intended to help teams identify deliverability problems and assess whether messages are reaching inboxes or spam folders; outcomes depend on mailbox configuration, provider policies, and sending practices.

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

B2B sales teams, SDRs, founders and cold email agencies that need their outreach to land in the inbox

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 Supported

Screenshots and Videos

No images available

Screenshots and Videos

No images available

Pricing

$49/month
Free Version Not Supported
Free Trial Supported

Pricing

$9/month
Paid plans start at $9/month and include unlimited mailboxes; daily warmup email limits vary by plan. A 7-day free trial is available, and the free tier supports one mailbox with 50 warmup emails per day.
Free Version Supported
Free Trial 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:

Review this Software

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

Training

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

Training

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

Company Information

InboxStack
Founded: 2025
India
inboxstack.com

Company Information

MailPilot
Founded: 2026
India
mailpilots.in

Alternatives

Alternatives

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E-Warmup

E-Warmup

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Mailwarm

Mailwarm

5.0 out of 5 stars
LiftInbox

LiftInbox

Unique Technologies

Categories

Categories

Email Warmup Supported

Integrations

Gmail Supported
Discord Not Supported
Microsoft Outlook Supported
Slack Not Supported
Yahoo! Mail Supported

Integrations

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