Mixed pipeline
One SMTP path
Marketing blast
Spam folder
Password reset
Blocked too
message streams
Separate transactional and marketing email with Message Streams.
Every email has a different job. When password resets share a pipeline with promotional blasts, one spam complaint can block critical receipts. Message Streams split your SMTP traffic into isolated paths — each with its own domains, analytics, and webhooks.
What are Message Streams?
Message Streams are dedicated sending pipelines inside SMTPServer. Each stream routes a type of email — transactional, marketing, onboarding, or alerts — through its own domain pool and reputation path. If a marketing campaign spikes bounces, your transactional stream keeps delivering without cross-contamination.
Message Streams
Stream router
Transactional
Inbox
Marketing
Isolated stats
Alerts
Webhooks
Critical mail keeps delivering
Mixed traffic drags everything down. Isolated streams protect the mail that matters most.
Why should you separate transactional and marketing email?
Mixed traffic is the fastest way to lose inbox placement for the messages that matter most.
Protect critical sends
Receipts, 2FA codes, and password resets stay on a clean transactional stream — isolated from high-volume promotional sends.
See what actually performs
Stream-level stats show sent volume, delivery rate, and bounces per pipeline — not a blended average that hides problems.
3
Built-in stream types
1+
Domains per stream
€39
Dedicated IP plans from
Stream-level analytics in your dashboard
Track delivery trends, outcome splits, and domain pool performance for each message stream — without mixing transactional and bulk data.
How do Message Streams protect deliverability?
Multi-domain flexibility
Map one or many domains to a single stream. Run a SaaS app and agency clients from one account with clean, branded sender signatures.
Stream segmentation
Create streams per segment, campaign type, or department. Keep transactional mail on dedicated IPs separate from newsletters.
Precision analytics
Compare onboarding vs weekly digest streams side by side. Spot bounce spikes and complaint trends before they spread.
Real-time webhooks
Trigger automations when a stream reports a bounce, complaint, or click. See API integration for webhook setup.
How do you set up a Message Stream?
1
Create a stream
Name it for the traffic type — transactional, marketing, or alerts.
2
Map domains
Attach one or more verified domains to the stream's pool.
3
Route traffic
Point SMTP or API sends at the stream-specific credentials.
4
Monitor analytics
Review delivery stats and webhooks per stream in the dashboard.
Who benefits from Message Streams?
If you are…The challengeHow streams help
SaaS founder
Password resets land in spam because they share an IP with outreach campaigns.
Create a Transactional Stream for app alerts and a Marketing Stream for product updates.
Growth marketer
A/B test campaigns risk your primary domain reputation.
Map a secondary domain to an Outreach Stream with its own analytics.
Developer
Hard bounces should pause user accounts automatically.
Configure a webhook on your Alerts Stream — catch
hard_bounce events in your backend.
Common questions about Message Streams
Can I attach multiple domains to one stream?
Yes. Map one or many verified domains to a single stream for branded sending across business units — see multiple domain setup.
Do Message Streams have separate analytics?
Each stream reports sent volume, delivery rate, bounces, and domain pool performance independently in the dashboard.
How do webhooks work per stream?
Add HTTPS webhook URLs in the dashboard. Events like bounces, complaints, and clicks fire only for traffic in that stream.
Are Message Streams included in all plans?
Stream segmentation and analytics are available on paid plans with dedicated IPs. Start on the free plan to test SMTP, then upgrade on plans.
Reclaim your inbox placement.
Split transactional and marketing traffic into Message Streams — quick DNS setup, transparent EUR pricing, and chat support when you need it.
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