DKIM Signing

DKIM (DomainKeys Identified Mail) adds a cryptographic signature to outgoing emails, proving they originate from your domain. This significantly improves deliverability and reduces spam classification.

How DKIM works with Altermail

When you complete DKIM setup for a domain, all emails sent from that domain are automatically signed, with no extra parameters required in the API call.

The response includes a dkimSigned: true/false field confirming whether signing was applied.

To enable DKIM, go to the Domains page and complete all 6 steps: add domain → add ownership TXT → verify ownership → add DKIM TXT → confirm DKIM. Once active, the DKIM ✓ badge appears next to your domain.

// Response when DKIM is active for the sender domain
{
  "Status": "Queued",
  "dkimSigned": true,   // ← DKIM signature will be applied on delivery
  ...
}

// Response when DKIM is not yet set up
{
  "Status": "Queued",
  "dkimSigned": false,  // ← Email still sends, just unsigned
  ...
}