Create the plan
Order SMTP in the client portal and note your credentials.
// INTEGRATION
Connect Layer 9 SMTP.
Standard SMTP. No proprietary SDK required — four values and you are sending.
// CONNECTION
Primary settings
HOST mail.l9s.io PORT 587 SECURITY STARTTLS AUTH Username / Password
Alternative TLS HOST mail.l9s.io PORT 465 SECURITY TLS AUTH Username / Password
// CHECKLIST
Before you go live
Publish SPF
Authorise mail.l9s.io (or the include we provide) for your domain.
Enable DKIM
Add the DKIM TXT records from the portal for each sending domain.
Set DMARC
Start with monitoring (p=none) then tighten once aligned.
Test delivery
Send to multiple providers and check headers for authentication pass.
Wire webhooks
On supported plans, subscribe to delivery events for observability.