đ OSH.co.za Domain Deliverability Checker
SPF, DKIM, DMARC, FCrDNS, Blacklists & Inbox Prediction
đŦ Inbox Placement Prediction
đ Google/Yahoo 2024 Bulk Sender Requirements Checking...
Requirements for sending 5,000+ emails/day to Gmail or Yahoo users.
â IP Reputation & FCrDNS Checking...
đ Domain Reputation Checking...
đ¨ SPF Record Checking...
đ¨ Mail Servers (MX) Checking...
đ§ Service Discovery (SRV) Checking...
đ DKIM Records Checking...
Check for additional DKIM selectors (you can use commas to separate multiple selectors):
â DMARC Record Checking...
đ MTA-STS Checking...
đĻ BIMI (Optional) Checking...
đ TLS-RPT Checking...
đ DANE/TLSA (Optional) Checking...
đ Nameservers Checking...
đ Zone Authority (SOA) Checking...
Need expert help fixing these issues?
đ§ Related Tools
Diagnose SPF, DKIM, DMARC, and Blacklist issues for any domain.
Split long DKIM or SPF records for AWS Route 53's 255 character limit.
Free Email Deliverability Checker - Diagnose SPF, DKIM, DMARC Issues
Are your emails landing in spam folders? Our free domain deliverability checker provides instant, comprehensive analysis of your email authentication setup. This tool scans your domain's SPF records, DKIM signatures, and DMARC policies to identify configuration errors that cause email delivery failures.
Email authentication has become critical since Google, Microsoft, and Yahoo implemented strict sender requirements in 2024. Without properly configured SPF, DKIM, and DMARC records, your marketing emails, invoices, and important business communications may never reach your customers' inboxes. Our checker also validates MTA-STS, TLS-RPT, BIMI, and DANE records for complete email security compliance.
Beyond authentication, we check if your mail server IPs are listed on email blacklists (RBLs) and verify Forward-Confirmed reverse DNS (FCrDNS). Get actionable recommendations with provider-specific setup guides for Google Workspace, Microsoft 365, Mailchimp, SendGrid, and 50+ other email services.
Need professional help? OSH.co.za specialises in DMARC implementation and email deliverability consulting for businesses across South Africa and worldwide. We help companies fix email authentication issues, improve inbox placement rates, and protect their domains from spoofing and phishing attacks.
Frequently Asked Questions
What is SPF and why do I need it?
SPF (Sender Policy Framework) is a DNS record that specifies which mail servers are authorised to send email on behalf of your domain. Without SPF, spammers can forge emails appearing to come from your domain, and receiving servers may reject or spam-folder your legitimate emails.
What is DKIM and how does it work?
DKIM (DomainKeys Identified Mail) adds a digital signature to your outgoing emails. The receiving server verifies this signature against a public key published in your DNS records. This proves the email genuinely came from your domain and wasn't modified in transit.
What does DMARC do?
DMARC (Domain-based Message Authentication, Reporting & Conformance) tells receiving servers what to do when emails fail SPF or DKIM checks. It also enables you to receive reports about who is sending email using your domain, helping you identify unauthorised use and phishing attempts.
Why are my emails going to spam?
Common causes include missing or misconfigured SPF/DKIM/DMARC records, your sending IP being on a blacklist, poor sender reputation, or failing to meet bulk sender requirements. Run a scan above to identify specific issues affecting your domain.
What are the 2024 bulk sender requirements?
Google, Yahoo, and Microsoft now require bulk senders (5,000+ emails/day) to have valid SPF, DKIM, and DMARC records, maintain spam complaint rates below 0.3%, include one-click unsubscribe, and use a matching From domain. Non-compliance results in email rejection.
What is MTA-STS?
MTA-STS (Mail Transfer Agent Strict Transport Security) enforces TLS encryption for email delivery to your domain. It prevents downgrade attacks where attackers intercept emails by forcing unencrypted connections. While optional, it significantly improves email security.
How do I fix email deliverability issues?
Start by running a scan above to identify problems. Follow the recommendations provided for each issue. For complex configurations or if you need expert assistance, contact OSH.co.za - we specialise in email authentication and deliverability solutions.
Privacy Policy
Data Collection: When you scan a domain, we query public DNS records and perform standard email deliverability checks. The domain name you scan may be logged for service improvement and abuse prevention. If you submit a support request, we collect your name, email, and message to respond to your enquiry.
Data Usage: Scan data is used solely to provide results and improve our service. Support requests are handled by OSH.co.za and used only to respond to your enquiry. We do not sell or share your personal information with third parties for marketing purposes.
Third-Party Services: This tool uses Google's DNS-over-HTTPS service for DNS lookups and IP geolocation APIs for server location information. These services have their own privacy policies.
Contact: For privacy enquiries or data deletion requests, please contact us at osh.co.za/contact.
Route 53 Splitter Tool âĸ Built by OSH.co.za - Email Deliverability & DMARC Specialists