Email records · Hostinger · Microsoft 365

How do I set up DKIM at Hostinger for Microsoft 365?

Copy the two CNAME records Microsoft shows for your domain in the Defender portal, add them in your Hostinger DNS records at selector1._domainkey and selector2._domainkey, then turn on DKIM signing for the domain in the same portal.

Last read , from the sources at the foot of this page.

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01

What does DKIM do?

It adds a signature to each message your domain sends. A mail server checks the signature against a key published in your DNS, so a message changed or forged on the way fails.

02

Where does Microsoft 365 make the key?

In the Defender portal, go to Email & collaboration, then Policies & rules, then Threat policies, then Email authentication settings, and open the DKIM tab. Select your domain. Under Publish CNAMEs, Microsoft shows the two values for your domain. Copy them from there: they differ by domain, and a newer domain uses a newer format.

Name of the first record
selector1._domainkey
Name of the second record
selector2._domainkey
03

How do I add them at Hostinger?

  1. Sign in to Hostinger hPanel and go to Domains, then Domain portfolio.
  2. Click Manage beside your domain and open DNS / Nameservers.
  3. Start a new record and choose CNAME as its type.
  4. Type selector1._domainkey in Name. Leave your domain name out: it is added for you.
  5. Paste the first value Microsoft shows in Target, exactly as copied.
  6. Save the record.
  7. Add the second record the same way, named selector2._domainkey, with the second value.

In our words, from Hostinger: adding a CNAME record, read 14 October 2026. If a screen has changed since, follow the host's own page.

04

How do I turn signing on?

Go back to the DKIM tab in the Defender portal, select your domain, and set Sign messages for this domain with DKIM signatures to Enabled. If the portal says the records are missing, wait for your DNS change to be seen and try again.

Sources

Where does this come from?

DMARC at Hostinger for Microsoft 365SPF at Hostinger for Microsoft 365DKIM at Hostinger for Google WorkspaceEvery DNS host and record
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