Connection summary
- HOST: mail.l9s.io
- PORT: 587 STARTTLS or 465 TLS
- AUTH: username + password
- DNS: SPF/DKIM/DMARC
FAQ
Where do I find credentials?
In the Layer 9 client portal after ordering SMTP.
// GUIDES
SMTP AUTH in plain English
SMTP authentication proves your app may submit mail. Layer 9 issues credentials in the portal — combine with TLS and DNS auth.