Free email security tools
Test your domain's email security yourself. Every tool runs on live DNS data, and none of them needs an account.
If your emails aren't reaching recipients, start with an email blacklist check. If they arrive but land in spam, check your SPF, DKIM and DMARC records. If incoming mail goes missing, the problem is most likely your MX records. Got a bounce message? Look up what it means in our SMTP error codes guide.
SPF, DKIM & DMARC check
Looks up your domain's email authentication records and flags anything missing or misconfigured.
Email blacklist check (IP blacklist lookup)
Checks whether your IP address or mail server appears on 6 well-known blacklists.
MX record lookup
Shows which servers receive mail for your domain, their priority order and any likely problems.
SPF record generator
Tick the services you send email through and get an SPF record that's ready to copy.
Email header analyzer
Paste a header to see SPF/DKIM/DMARC results and the server hop chain. Your data never leaves your browser.