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How to Use the DKIM Lookup Tool to Verify Email Signing

March 17, 2026•1 min read•Updated October 8, 2026

What is DKIM?

DKIM (DomainKeys Identified Mail) adds a digital signature to your outgoing emails. This proves the email genuinely came from your domain and was not altered in transit. It significantly improves deliverability.

How DKIM Works with Mailbux

Mailbux auto-generates DKIM keys for each domain. You need to:

  1. In dash.mailbux.com, open your plan → Manage → DKIM and create the key if there is none yet
  2. Open Manage → DNS to see the DKIM TXT record (selector and value)
  3. Copy that record and add it at your DNS provider

Important: Each domain gets unique DKIM keys. Do not copy DKIM records from one domain to another.

How to Verify DKIM is Working

  1. Go to DKIM Lookup Tool
  2. Enter your domain name and the DKIM selector (shown in your Mailbux DNS records)
  3. Click Lookup
  4. You should see a valid DKIM public key in the results

Common Issues

  • "No DKIM record found": Make sure you enabled DKIM in Mailbux AND added the TXT records to your DNS
  • Wrong selector: Use the exact selector shown in Manage → DNS (or Manage → DKIM), not a generic one
  • Propagation delay: DNS changes can take 5-60 minutes. Wait and try again

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