Dev
£5/mo- 1,000 emails / mo
- 1 sending domain
- SMTP auth
Layer 9 SMTP
SMTP relay for transactional email.
Authenticated relay at mail.l9s.io for apps and websites. SPF, DKIM, DMARC and TLS included. Plans from £5/mo.
£5Plans from / month
587STARTTLS port
465Direct TLS
mail.l9s.ioSMTP host
Plans
Starter
£10/mo- 10,000 emails / mo
- 1 sending domain
- SMTP / API
Professional
£20/mo- 25,000 emails / mo
- 3 domains
- Webhooks
Business
£35/mo- 75,000 emails / mo
- 10 domains
- Webhooks
Enterprise
Custom- 100,000+ emails
- Unlimited domains
- Dedicated IP
What you get
Standard SMTP
HOST, PORT, USER, PASS — no proprietary SDK.
Authentication
SPF, DKIM and DMARC records for your sending domain.
TLS
STARTTLS on 587 and direct TLS on 465.
Logs and webhooks
Delivery events on Professional and above.
Relay reputation
IPs we monitor, not shared consumer pools.
UK-operated
Same company as Layer 9 Hosting and VPN.
Questions
Can I use WordPress?
Yes. Any SMTP plugin with mail.l9s.io, port 587, and your portal credentials.
Is this for marketing mail?
No. It is for transactional and application mail. Bulk marketing is not allowed.
How long does setup take?
DNS plus SMTP settings is usually done in a few minutes once you have the records.
Which ports do you support?
587 with STARTTLS and 465 with direct TLS.
View SMTP plans
Dev from £5/mo. Host mail.l9s.io, port 587.