Inspect, diagnose, and optimize
your email infrastructure
Eight production-grade diagnostic tools for SPF, DKIM, DMARC, DNS records,
IP reputation, reverse pointers, and client-safe email signatures.
DKIM Record Checker
Look up a DKIM TXT record, inspect its tags and published key data, and review the estimated RSA key size.
- Tests selector DNS TXT record resolution
- Estimates RSA key size from published key data
- Parses v=DKIM1, k=rsa, and p= key tags
DMARC Policy Validator
Audit domain DMARC records against Google and Yahoo 2024 bulk sender rules. Inspect p=reject policy enforcement, aggregate report routing, and alignment pass rates.
- Verifies p=reject and quarantine protection
- Inspects rua and ruf reporting destinations
- Confirms Google & Yahoo bulk sender compliance
SPF Record Checker
Validate Sender Policy Framework mechanisms, resolve recursive include: chains, and calculate DNS lookups to stay safely below the RFC 10-query barrier.
- Counts DNS lookups against the strict 10-query limit
- Validates ip4, ip6, include, and all qualifiers
- Detects syntax mistakes and duplicate SPF entries
IP Blacklist Checker
Monitor your sending IP address or domain across 50+ major DNSBL/RBL databases including Spamhaus, Barracuda, and SORBS to protect your inbox rate.
- Real-time lookup across major DNSBL/RBL providers
- Monitors Spamhaus ZEN, Barracuda, and Spamcop
- Instant delisting advice for flagged mail servers
DNS Records Lookup
Query DNS records including A, AAAA, MX, TXT, CNAME, NS, SOA, and CAA, and review the returned resolver data.
- Queries 8 core DNS record types instantly
- Live resolution latency and nameserver breakdown
- Authoritative answer and TTL inspection
CNAME Alias Resolver
Trace canonical alias chains, verify custom branded subdomains for email tracking and custom sending domains, and prevent redirection loops.
- Follows multi-hop canonical alias chains
- Verifies custom tracking & click domain setup
- Detects circular redirection and broken targets
Reverse DNS (PTR) Lookup
Test Forward-Confirmed Reverse DNS (FCrDNS) alignment between mail server IPs and hostnames to satisfy strict Gmail and Microsoft inbound spam filters.
- Queries IPv4 and IPv6 PTR in-addr.arpa records
- Validates Forward-Confirmed Reverse DNS (FCrDNS)
- Essential for preventing mail rejection by Outlook & Gmail
Email Signature Generator
Design responsive, table-based HTML email signatures with social links, custom brand accents, avatar images, and one-click export for Gmail and Outlook.
- 100% table-based HTML compatible with all major email clients
- Custom brand accent colors and photo avatar integration
- Direct one-click rich clipboard copy for Gmail & Outlook
Ready to put your email checks to work?
Send through Mailofly’s REST API or SMTP relay, then use delivery records, signed webhooks, suppression controls, and domain verification tools to monitor your workflow.