Security & SEO

    DKIM record check

    Verifies DKIM selector records exist and use ≥1024-bit keys — the invisible half of email deliverability that most teams forget.

    Updated 2026-07-10
    1 min read
    dkim
    email
    deliverability

    Quick answer#

    Add your DKIM selectors in the site editor. Lemwatch checks that each selector._domainkey record resolves and uses a strong key.

    What it checks#

  1. Selector TXT record resolves
  2. Key length (flags <1024-bit as weak)
  3. p= (public key) is not empty (empty means revoked)
  4. v=DKIM1 tag present

    5. Where to find it in Lemwatch#

    Site details → Security → Email auth → Selectors. Add one row per selector (e.g. google, s1).

    How to fix#

  5. Ask your mail provider for their DKIM selector name.
  6. Add the selector in Lemwatch.
  7. Publish the TXT record at <selector>._domainkey.yourdomain.com.
  8. Rotate keys yearly to 2048-bit.

    9. FAQ#

    How many selectors can I add?#

    Up to 5 per site.

    Does Lemwatch verify signatures on real messages?#

    No — record health only. For signature verification use your provider's dashboard.

    Related#

  9. SPF record check
  10. DMARC record check
  11. DNS MX record check
    12. Was this article helpful?

    Previous

    SPF record check

    Next

    DMARC record check

    Related Articles

    SPF record check

    Parses your SPF record, counts DNS lookups (10 max), and warns before you hit the RFC 7208 limit that silently breaks deliverability.

    DMARC record check

    Explains how to read a DMARC record, assess SPF and DKIM alignment, and make a staged policy decision without treating a DNS record as proof of mail delivery.

    DNS MX record check

    Monitors MX records so a fat-fingered mail edit or expired provider does not silently break customer email.

    Certificate chain check

    Verifies your TLS cert is served with the full intermediate chain — the #1 cause of "insecure connection" errors on Android and older curl.

    Back to Help Center