InboxGuard: Email Deliverability Diagnostic

InboxGuard | AI-Powered Email Deliverability & Spam Diagnostic | B2B Toolbox

Ensure your emails land in the primary inbox. Analyze SPF/DKIM/DMARC records, check RBL blacklists, and use AI-powered heuristic analysis to find spam triggers before you send.
Stop landing in spam. InboxGuard scans your email headers, domain records (SPF/DKIM/DMARC), and content for spam triggers using advanced heuristic analysis.
Drastically reduces spam-folder placement and protects domain reputation for high-volume B2B senders.
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InboxGuard: Email Deliverability Diagnostic

Ensure your emails land in the primary inbox. Analyze SPF/DKIM/DMARC records, check RBL blacklists, and use AI-powered heuristic analysis to find spam triggers before you send.

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Configuration
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Diagnostic
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Report
Live Interception

Send your test campaign email to our diagnostic node:

Header Extraction

Paste the full content from Gmail's "Show Original" or Outlook's "View Message Source" below.

Quick Form

Processing Data...

Querying DNS records and calculating heuristic scores...

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Analyzing...
Diagnostic Summary

Analysis of your sender profile and content risk factors.

Authentication
SPF Record ...
DKIM Signature ...
DMARC Policy ...
Reputation
IP Blacklist ...
Domain Age ...
SSL/TLS ...
Heuristic Content
Subject Analysis ...
Spammy Keywords ...
Link Diversity / Quality ...
Text/HTML Ratio ...

Why Email Deliverability Matters

Sending a cold email or a marketing campaign is only half the battle. If your technical infrastructure isn't properly configured, or your content triggers spam filters, your message will land in the "Junk" folder—or worse, your domain could be blacklisted.

Inbox Guard is a deep-dive diagnostic tool designed to simulate how Gmail, Outlook, and other major ISPs view your incoming emails. We analyze the three pillars of deliverability: Authentication, Reputation, and Content Integrity.

Live Interception

Don't just check your DNS; send an actual email to our node. We parse the real headers as an ISP would.

AI-Powered Content Analysis

Our LLM-driven engine identifies aggressive sales language, suspicious links, and formatting errors.

Frequently Asked Questions

What is an SPF record?
Sender Policy Framework (SPF) is a DNS record that lists the IP addresses authorized to send emails on behalf of your domain. Without it, recipients have no way to verify you aren't a spoofing attempt.
Why did my DKIM check warn me?
DKIM adds a digital signature to your emails. A warning usually means the signature is missing or the selector used by your email provider isn't being recognized during the live test.
Is this tool free to use?
Yes! Inbox Guard is part of our B2B Toolbox suite. We provide deep technical analysis at no cost to help senders maintain a healthy ecosystem.
What are "Spammy Keywords"?
Phrases like "Act Now", "Free Money", or "100% Guaranteed" are often flagged by heuristic filters. Our AI scans your body text for these triggers.