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Check if your emails are reaching the inbox.

SPF, DKIM and DMARC tell Gmail, Outlook and Yahoo whether to trust your domain. Run a free check to see exactly what is passing, what is failing, and what to fix.

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No signup required. Results in 30 seconds. Works on any domain.

notifications_active Monitor your domain automatically - get alerts when something breaks

What Breaks Inboxing And What We Check

Each of these silently filters your mail without any bounce or error message

High risk

SPF Record Validator

A missing or broken SPF record tells Gmail and Outlook your server is not authorized to send for your domain. Campaigns, invoices and password resets get spam foldered or rejected silently.
High risk

DKIM Signature Checker

DKIM failure means your messages arrive without cryptographic proof they weren't tampered with. Outlook in particular will quietly move unsigned mail to junk, even when SPF passes.
Critical for protection

DMARC Policy Analyzer

Without DMARC, anyone can spoof your domain and send phishing mail pretending to be you. With it set to quarantine or reject, providers trust your mail more and protect your brand.
Required by Gmail & Yahoo

List-Unsubscribe Builder

Gmail and Yahoo now require one-click unsubscribe headers (RFC 8058) for bulk senders. Missing this header increases spam complaints and triggers filtering at scale.
Instant fix

Fix Kit Generator

Get ready-to-paste DNS records for Cloudflare, Namecheap, Google Workspace, Microsoft 365, SendGrid, Mailgun and more. No guessing, no documentation hunting. Exact values for your setup.
Ongoing protection

Deliverability Monitoring

DNS records break silently. A provider change, a typo, a new tool added. Daily monitoring catches the moment something breaks and alerts you before open rates collapse.

Trusted by Founders, Marketers and Agencies

14,800+

free domain checks run

3,400+

authentication issues caught

620+

domains actively monitored

"I had no idea my DKIM was broken. Campaigns were going to spam for weeks and I blamed the copy. Ran the check and fixed it in 20 minutes."

Marcus T. - SaaS Founder

"We manage 18 client domains. The agency plan gives us peace of mind that nobody's deliverability is silently tanking between our monthly reviews."

Daniela R. - Email Marketing Agency

"Our invoice emails were going to spam for an entire month. The fix kit gave us the exact DNS records to paste. Took 10 minutes to recover."

Kevin S. - E-commerce Operations

Common Problems We Help Fix

If any of these sound familiar, your domain is already affected

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Emails going to spam in Gmail or Outlook

Step-by-step diagnosis and recovery checklist
block

Domain blacklisted

How to confirm, find the cause and get delisted
gpp_bad

Listed on Spamhaus

What it means, how to recover and how long it takes
trending_down

Google Postmaster showing bad reputation

Fastest way to recover Gmail sender reputation
report

High spam complaint rate

Fix list hygiene and sending patterns before reputation collapses
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New domain going straight to spam

Safe warm-up strategy and authentication setup
View all deliverability problems

Frequently Asked Questions

How does InboxGreen improve deliverability? expand_more
By validating and fixing SPF, DKIM, and DMARC authentication, plus adding one-click unsubscribe headers, your domain gains trust with major providers.
Is the checker free? expand_more
Yes. You can run unlimited free checks. Advanced features like domain monitoring, PDF reports, and alerts are available in paid plans.
Why are my emails going to spam even though they worked before? expand_more
The most common cause is a DNS change that broke SPF or DKIM without anyone noticing. It happens when you add a new email tool, switch providers, or update DNS records for another reason. Run a free check to see exactly which record changed and what needs fixing.
What SPF record do I need for Google Workspace? expand_more
For Google Workspace, your SPF record needs to include include:_spf.google.com. A basic record looks like: v=spf1 include:_spf.google.com ~all. If you also send through other providers like SendGrid or Mailgun, use the SPF generator to combine them into a single valid record.
What SPF record do I need for Microsoft 365? expand_more
For Microsoft 365, your SPF record should include include:spf.protection.outlook.com. A standard record looks like: v=spf1 include:spf.protection.outlook.com ~all. Never add a second SPF TXT record. Merge everything into one.
What does DMARC p=none mean and is it safe? expand_more
p=none is monitoring mode. It tells receivers to take no action on failing mail and just send you reports. It is safe to start with but it does not protect you from spoofing and does not improve inbox placement. Once SPF and DKIM are passing reliably, move to p=quarantine or p=reject for real enforcement.
How do I know if my domain is on a blacklist? expand_more
Run a free check on your domain above. The scan includes a blacklist lookup across major blocklists including Spamhaus, Barracuda and SURBL. If you are listed, the results will show which list and link you to the delisting process.
Can agencies white-label the reports? expand_more
Yes, the Agency plan includes full white-label PDF branding and multi-domain management.
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