Sign every email from your domain.
Ed25519 DKIM-style signing. Every email from your domain carries a cryptographic signature that can't be forged without your private key.
$2.9 billion lost to BEC attacks in 2023 (FBI IC3). Don't be next.
Quickstart
Protect a domain from the command line. Base URL https://mailseal-api.qntyx.io — authenticate with Authorization: Bearer $QNTYX_KEY.
# 1. Create an API key in your dashboard → API Keys export QNTYX_KEY="qntyx_mail_…" # 2. Register the domain you want to protect curl -X POST https://mailseal-api.qntyx.io/domains/ \ -H "Authorization: Bearer $QNTYX_KEY" -H "Content-Type: application/json" \ -d '{"domain_name": "example.com"}' # Then add the returned DNS records — after that, recipients can verify every email you send.
30 seconds to quantum-sign your emails
Add Domain
Register your domain. We generate an Ed25519 key pair for your domain.
Add DNS Record
Copy one TXT record to your DNS provider. Works with Cloudflare, Route53, GoDaddy, Namecheap.
All Email Signed
Every outbound email carries an Ed25519 signature. Spoofed emails fail Qntyx verification instantly.
Host: quantum1._domainkey.yourdomain.com
Value: v=DKIM1; k=ed25519; p=MCowBQYDK2VwAyEA...
This is the only DNS change you need. One record. Done.
Quantum vs Standard DKIM
RSA-2048 DKIM (standard)
Uses 2048-bit RSA keys — larger and slower than modern curves, and strained by DNS TXT record size limits. Most email providers still use RSA.
Ed25519 (Mail Seal)
Ed25519 signatures — 64x smaller keys than RSA-2048, faster signing.
Pricing
- 5 domains
- Ed25519 DKIM signing
- Ed25519 key generation
- Key rotation
- DMARC policy generator
- Unlimited domains
- Webhook alerts
- SIEM integration
- Domain reputation API
- Priority support + SLA