Provider onboarding
Verify the exact selector your mail platform expects before waiting on signing tests to fail.
DKIM Checker
Lookup a DKIM selector and inspect the published key.
Dev + Network
Use the selector your mail provider gave you. Many domains publish more than one selector.
Tip: double-click any visible result to copy it to your clipboard.
Email auth
Check a DKIM selector before you test mail flow the hard way.
DKIM problems often come down to the wrong selector or a missing TXT record. This tool looks up the exact selector host and shows whether the key is there.
Highlights
- Checks selector._domainkey hosts directly.
- Shows the published TXT data, key type, and flags when found.
- Useful during provider setup, mailbox warmup, and post-cutover checks.
Cutover checks
Confirm the DNS side is live after moving senders or replacing an old mail service.
Selector cleanup
See quickly whether default, mail, google, or another selector is the one that actually exists.
How to use it
Check the selector first and skip an avoidable mail-auth detour.
01
Enter domain and selector
Use the selector label from your mail platform setup guide.
02
Run the lookup
Tooloh checks the DKIM TXT record at the exact host name.
03
Review key details
Use the result to confirm the record exists before you move on to full deliverability tests.
Related tools
Same vibe. Same speed.
SPF Checker
Dev + Network
Find and inspect the SPF policy on a domain.
DMARC Checker
Dev + Network
Inspect DMARC policy, reporting, and enforcement tags.
MX Lookup
Dev + Network
Check mail exchanger records for a domain.
DNS Lookup
Dev + Network
Lookup DNS records (A, AAAA, CNAME, MX, TXT).
FAQ
Quick answers. No walls of text.
What is a DKIM selector?
A selector is the label used to find the DKIM public key for a sending service, usually at selector._domainkey.example.com.
Why did the lookup fail?
The selector may be wrong, unpublished, or the provider may use a different label than default.
Does this prove mail is signed correctly?
No. It checks the published key record, not the live signature headers inside a message.