Message Streams

Neatly separated sending, one account

Message Streams split your email into tidy, isolated lanes — each with its own IPs, domains, suppressions and stats. Set one up in a click, and bulk mail can never smudge your critical sends.

Transactional and broadcast streams stay separate
Complete isolation

Transactional here, broadcast there

Every stream gets its own sending IPs, domains, suppression lists and statistics. Broadcast mail travels on infrastructure that never touches your transactional lane, so a heavy promo blast can never drag your password resets into spam.

  • Separate IPs, domains and suppressions for every stream
  • Stats and webhooks scoped per stream, never blended together
  • Broadcast traffic can never hurt transactional deliverability
See per-stream analytics
Under the hood

Isolation where it counts

Streams aren't just folders. Each one is a self-contained sending environment with its own moving parts.

Dedicated suppressions

Every stream keeps its own suppression list. A hard bounce from your newsletter audience never blocks a customer's receipt — and you can inspect or edit each list without touching the others.

Per-stream settings

Retention windows, webhook endpoints, open and click tracking — tuned stream by stream. Keep 45 days of receipts while trimming bulk campaign logs to a week, if that's your thing.

Smart defaults

Every server ships with an outbound stream that's ready to send the moment your domain verifies. No configuration marathon between you and your first email.

One server, one stream per client
Made for agencies

Every client neatly boxed in

Run all your clients from a single PostedApi account. Give each one their own stream inside a dedicated server, and their sends, stats and suppressions stay perfectly boxed in — no shared lanes, no cross-contamination, no spreadsheet gymnastics.

  • Spin up a stream per client in seconds, inside a server per project
  • Client A's promo can never dent Client B's receipt deliverability
  • Per-stream usage, ready to copy straight into your invoices
  • Hand a stream — or a whole server — over when the project ends
How agencies use PostedApi
Broadcast streams

Bulk sending, minus the blast radius

Broadcast streams are built for mail you send in batches: newsletters, product announcements, onboarding sequences. They ride on separate bulk infrastructure with its own IPs and throttling, so volume spikes stay far away from your transactional lane.

Newsletters

Weekly digests and editorial sends, batched and throttled on infrastructure made for volume — not squeezed through your receipts pipeline.

Announcements

Ship product news to your entire audience at once, with delivery stats that never mingle with the transactional numbers you report on.

Onboarding drips

Welcome sequences and timed nudges that go out quietly in the background — batched, monitored and kept off your urgent lane.

Tidy sending starts with one click

Create your account and get a ready-to-send outbound stream, plus a broadcast stream whenever you need it. 100 emails a month for $1.90 — upgrade or cancel anytime.