Network ToolsFree DNS Checker
DNS Toolbox
Query A, AAAA, MX, TXT, NS, CNAME, CAA, and SOA records with automatic SPF and DMARC verification.
- Standard 8 record types
- Automatic SPF detection
- DMARC policy lookup
- TTL inspect & copy
FREE EMAIL DELIVERABILITY & SPAMASSASSIN AUDITORWebsite Tools
Email Spam Checker & Deliverability Tester
Mail-Tester alternative: Audit SPF 10-lookup limit, DKIM selector, DMARC policy, MX records, 12 DNSBL blacklists, and spam keywords with 1-click AI fix prompts.
Quick Definition
An email deliverability test evaluates SPF, DKIM, DMARC authentication, DNSBL blacklist reputation, and content spam signals to calculate an overall deliverability score out of 10.
📬 Email Spam & Deliverability Checker
What this tool tests for 100% Primary Inbox Delivery:
SPF & DKIM Authentication
Validates sending IP authorization and cryptographic public key signatures required by Gmail & Yahoo 2024+ rules.
DMARC Policy Enforcement
Checks if your domain enforces p=quarantine or p=reject to prevent spoofing and domain reputation hijacking.
20+ Real-Time Blacklists
Queries Spamhaus, Barracuda, SpamCop, and SORBS in real time to ensure your IP and domain are not blacklisted.
1-Click AI Fix Prompts
Generates ready-to-copy prompts to fix missing DNS records or spam trigger words directly with ChatGPT / Cursor.
HIGH-DELIVERABILITY INFRASTRUCTURE
Send emails that always reach the primary inbox
Monitor domain reputation, automate DNS health checks, and eliminate spam filters with Uzvera deliverability monitoring.
COMMON QUESTIONS
Frequently Asked Questions about Email Deliverability
Learn how SPF, DKIM, DMARC, DNSBL blacklists, and mail content affect your inbox placement rate.
What is an Email Spam & Deliverability Checker?
It evaluates how likely your outgoing emails are to land in the inbox versus the junk/spam folder. It checks core authentication protocols (SPF, DKIM, DMARC, BIMI), mail server reputation across global DNSBL blacklists (Spamhaus, Barracuda, SORBS), and spam content triggers.
How does this compare to Mail-Tester.com?
Uzvera provides a 100% free Mail-Tester alternative without arbitrary daily limits or paid subscriptions. You can audit domains instantly, send test emails to disposable aliases, or paste raw EML content, complete with 1-click AI prompt generators for instant fixes.
What is the SPF 10-lookup limit and why does it cause deliverability issues?
RFC 7208 mandates that SPF records cannot require more than 10 DNS queries during evaluation (including 'include:', 'a', 'mx', 'ptr', and 'exists' mechanisms). If your record exceeds 10 lookups, receiving mail servers return a PermError, causing your emails to be flagged as spam.
Why is DMARC 'p=reject' or 'p=quarantine' required in 2026?
Google and Yahoo require all bulk and transactional senders to have a valid DMARC policy with SPF and DKIM alignment. Senders with 'p=none' or missing DMARC records face higher spam folder placement and outright message rejections.
What DNSBL blacklists does Uzvera query?
Uzvera queries 12 real-time DNS-based blackhole lists including Spamhaus (ZEN), Barracuda (b.barracudacentral.org), SORBS (dnsbl.sorbs.net), Spamcop (bl.spamcop.net), UCEPROTECT, and Invaluement, validating both your MX hostnames and sender IP addresses.