Email deliverabilitytoolbox.
Free tools to help you set up and debug email authentication. No account required.
SPF Record Generator
Build a valid SPF TXT DNS record for your domain. Select your authorized senders and copy the result.
Open toolDKIM Record Generator
Generate the DNS TXT record for DKIM email authentication. Paste your public key and configure your selector.
Open toolDMARC Record Generator
Create a DMARC policy for your domain. Configure enforcement, reporting, and subdomain policies.
Open toolEmail Header Analyzer
Paste raw email headers to visualize the delivery path, analyze authentication results, and identify delays.
Open toolSPF Flattener
Collapse nested SPF includes into a single record that uses only IP addresses — zero DNS lookups, no 10-lookup limit.
Open toolEmail Health Checker
Enter any domain to check its SPF, DKIM, and DMARC email authentication in real time. Free, no account needed.
Open toolBlocklist Checker
Check any domain and its mail server IPs against major DNS blocklists like Spamhaus, SpamCop, and Barracuda. Free, no account needed.
Open tool
Need more than generators?
LitInboxes gives you real-time DNS and blocklist monitoring, DMARC reports, reputation tracking, email verification, and more, all in one dashboard. Start with a 14-day free trial.
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