Email deliverability, X-rayed.
WillItInbox helps answer the question: will it inbox? Test the messages you send, validate the people you send to, monitor the domains behind them, invite the team that owns them, and automate the workflow with API keys, webhooks, and schedules.
Start free. No credit card. Cancel anytime.
Deliverability tester
0-100 score
Category breakdown
70+ checksTotal
72
Passed
52
Warnings
18
Failed
2
Email validator
95%
confidence
12
validation layers
All 12 verification layers
One workspace
More than a spam check.
Test, validate, monitor, automate
Test real emails
Generate a unique inbox, send from your app or ESP, then inspect 70+ authentication, DNS, header, content, link, reputation, and compliance checks.
Open workflowValidate recipients
Run 12-layer checks across syntax, DNS domain, MX record, SMTP, catch-all, disposable, role, typo, provider, and risk signals.
Open workflowMonitor domains & DMARC
Verify sending domains, scan SPF/DKIM/DMARC/BIMI/TLS posture, ingest DMARC reports, link Google Postmaster evidence, and label unknown sources.
Open workflowAutomate with API
Use API keys, bulk jobs, signed webhooks, delivery logs, usage history, report exports, and placement schedules.
Open workflowRun a team workspace
Invite teammates, rename workspaces, scope projects, review audit events, and brand reports for client-ready exports.
Open workflowDeliverability signals in one workspace
What you get back
Real product evidence, not a vanity score.
The homepage preview now mirrors the real deliverability report and email validator: 70+ message checks, 12 validation layers, recommendations, trust signals, and SMTP evidence.
Sanitized sample data
No private emails, tokens, or screenshots.
Deliverability tester
70+ message checks, scored like the live report.
No public sender IP detected
Localhost test sends still produce useful DNS, header, content, and link evidence.
Category breakdown
Total
72
Passed
52
Warnings
18
Failed
2
Recommendations
Linked Domain Reputation
Links - critical
Replace flagged tracking links, then request delisting after cleanup.
SPF Policy Strength
Authentication - warning
Tighten the SPF policy once all authorized senders are confirmed.
DMARC Policy Strength
Authentication - warning
Move toward quarantine or reject after monitoring alignment.
List-Unsubscribe
Headers - warning
Add one-click unsubscribe headers for bulk and lifecycle mail.
All checks
Authentication evidence
The tester keeps SPF, DKIM, DMARC, and alignment evidence visible next to the score.
Retest checklist
Prioritized next actions are grouped so the team can fix and retest the same message.
Email validator
12 validation layers, explained like the live validator.
Verify an email
250 validations remaining.
Trust signals
0 active suppressions, 0 bounces, 0 complaints.
Manual suppression
No evidence uploaded.
DSN bounce
No evidence uploaded.
ARF complaint
No evidence uploaded.
SMTP and provider evidence
Confidence
95% confidence from syntax, DNS/MX, provider, SMTP, catch-all, suppression, and risk evidence.
All 12 verification layers
Syntax
normalized_email: [email protected]
DNS
domain resolves with authoritative records
MX
mx1.company.example accepted for delivery
SMTP
mailbox accepted by provider
Catch-all
catch-all not detected
Disposable
domain is not disposable
Role-based
personal mailbox pattern
Provider
provider: Example MX
Domain age
established sender domain
Typo suggestion
no close typo found
Suppression
not present in suppression list
Spam trap
no trap signal detected
Who it's for
Built for everyone who ships email.
For developers
Ship transactional mail with confidence
You added DKIM in your ESP dashboard but Gmail still flags signups. WillItInbox shows you exactly which header alignment broke and which selector to fix.
For lifecycle teams
Diagnose campaigns before you press send
Trigger words, image-to-text ratios, missing List-Unsubscribe - every check that quietly knocks 10% off your open rate, in one report.
For platforms & IT
Audit every outbound path you own
Helpdesk, CRM, billing, HR - different SaaS, same domain. Run a test from each one and prove SPF, DMARC alignment, and reputation hold across all of them.
For agencies
Keep client work separated
Use workspaces, projects, branded exports, audit events, and teammate invitations to keep deliverability evidence ready for review.
Explore workflows
Everything important, without crowding the header.
Test and validate
Run a real-message deliverability test, verify one recipient, or clean a CSV list.
Monitor and diagnose
Track domain health, inspect DMARC and provider reputation evidence, and triage failing sender paths.
Build with API
Automate validation, test inbox creation, webhooks, and report workflows.
Name and purpose
Built around the question senders ask.
What is WillItInbox?
WillItInbox is an email deliverability tester and validation workspace for teams that need to know whether real messages, sender domains, and recipient lists are ready before they send.
Is WillItInbox the same as "will it inbox"?
Yes. The product name comes from the question every sender asks before a campaign or transactional email ships: will it inbox?
Three steps
Usually under a minute.
Choose the workflow
Run a message test, validate one address, upload a list, scan a domain, or inspect DMARC.
Collect real evidence
WillItInbox gathers DNS, SMTP, report, mailbox, webhook, scheduler, and account-scoped evidence.
Fix and automate
Use prioritized fixes, CSV exports, branded reports, API keys, webhooks, and monitoring to keep email healthy.
The five categories
One score. Five lenses.
Authentication
35SPF, DKIM, DMARC, BIMI
DNS & infra
20rDNS, blacklists, TLS, HELO
Headers
15Date, Message-ID, Reply-To
Content
20SpamAssassin, triggers
Links
10Shorteners, mismatches
Fast
Most reports complete within 15 seconds of receiving the email.
Private
No third-party APIs. Test emails are deleted within 24 hours.
One focused platform
Deliverability testing, validation, monitoring, DMARC, placement diagnostics, workspaces, and operations in one place.
Ready to see your score?
Generate a test address or validate a list. Start free, no card required.