SPF
Authorise the systems permitted to send for your domain.
// DELIVERABILITY
Good sending starts before SEND.
Authentication, alignment, and sensible sending practices matter more than marketing claims.
// MAIL HYGIENE
Built for trustworthy outbound mail.
DKIM
Cryptographically sign messages so recipients can validate them.
DMARC
Define alignment and reporting policy for your domain.
TLS
Encrypt SMTP transport where supported.
Webhooks
Use delivery events on supported plans.
Dedicated IP
Available on supported plans where isolation makes sense.
// PRACTICE
What we expect from senders
Layer 9 SMTP is designed for transactional and application mail — password resets, invoices, alerts, and product notifications. Bulk unsolicited marketing violates our anti-spam policy and will be suspended. Keep lists consented, handle bounces, and authenticate every domain you send from.