Email Deliverability Tester
What is Email Deliverability?
Email deliverability refers to your ability to successfully deliver emails to recipients' inboxes. It depends on proper configuration of authentication protocols (SPF, DKIM, DMARC) and mail server records (MX).
How This Tool Works
- Enter your domain name
- The tool performs DNS lookups for SPF, DMARC, and MX records
- It validates the presence and basic structure of each record
- A comprehensive report shows what's configured and what's missing
- Use the results to identify and fix configuration issues
What Each Check Means
- SPF: Specifies which mail servers can send email for your domain
- DKIM: Cryptographically signs emails to verify authenticity
- DMARC: Tells receiving servers how to handle failed authentication
- MX Records: Identifies mail servers that receive email for your domain
Common Issues & Fixes
- SPF Not Found: Add a TXT record starting with "v=spf1"
- DMARC Not Found: Add a TXT record at _dmarc.yourdomain.com
- MX Not Found: Configure mail server and add MX records
- Multiple Issues: Configure all three for best deliverability
Example: Well-Configured Domain
SPF Record:
v=spf1 ip4:192.0.2.0/24 include:_spf.google.com ~all
DMARC Record (_dmarc.example.com):
v=DMARC1; p=quarantine; rua=mailto:dmarc@example.com
MX Records:
10 mail1.example.com
20 mail2.example.com
Best Practices
- Implement all three authentication methods (SPF, DKIM, DMARC)
- Start with DMARC policy "p=none" for monitoring, then gradually enforce
- Use multiple MX records with different priorities for redundancy
- Test email sending after configuration changes
- Monitor DMARC reports to identify authentication issues
- Keep SPF records under 10 DNS lookups to avoid failures
Related Tools
- SPF Record Generator - Create SPF records
- DKIM Record Generator - Create DKIM records
- DMARC Checker - Detailed DMARC analysis
- MX Checker - Test mail server connectivity
- Email Blacklist Lookup - Check IP reputation