Features page (message streams) — Postmark

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Facts read from this source

• Message streams purpose Report an error

  “Message Streams optimize deliverability for all email: transactional, broadcast, and everything in between.”

• API message stream field Report an error

  “One API call, one MessageStream field”

• Separate ip pools Report an error

  “Dedicated transactional IP pool”

• Traffic never mixes Report an error

  “That means transactional and broadcast traffic do not mix in Postmark, including IP ranges.”

• Transactional stream definition Report an error

  “Triggered by what users do. Password resets, receipts, notifications.”

• Broadcast stream definition Report an error

  “Sent by you, to many. Product updates, digests, ToS notices.”

• Transactional API value Report an error

  “API value "outbound"”

• Opt out link broadcast required Report an error

  “Opt-out link Not required Required”

• Streams per server limit Report an error

  “You can have up to 10 Streams in a server which can help separate and organize your sending within an individual server.”

• Manual vetting Report an error

  “We’re still manually vetting each potential customer, chatting with them one-on-one about what they send and why.”

• Anti abuse systems Report an error

  “we’ve also built internal anti-abuse systems that not only help us analyze all senders’ performance but can also stop potentially spammy messages before they’re sent.”

• No marketing campaign features Report an error

  “we don’t offer some of the features you might want if you were sending traditional marketing campaigns, including support for list uploads, a WYSIWYG editor, and campaign-based reporting.”

• Unsubscribe webhook Report an error

  “We’re creating tools for managing unsubscribes and suppression lists, but you’ll need to continue managing your main email lists outside of Postmark. You can keep your lists in-sync with Postmark using a new unsubscribe webhook.”

• Broadcast no extra fees Report an error

  “There are no additional add-ons or fees to send broadcast messages. Any email you send through Postmark will count towards the monthly email limit for your subscription plan, just like transactional and inbound messages.”

• Legacy credits broadcast Report an error

  “For existing customers using our legacy credits pricing, each message will consume one credit.”

• Broadcast available existing customers Report an error

  “Are you an existing Postmark customer? Broadcast Message Streams are available in your Postmark account, and you can start sending right away!”

• Free trial no credit card Report an error

  “No credit card required · billions of emails delivered since 2010.”

• Broadcast approval required new users Report an error

  “When you’re ready to start sending Broadcast emails, just request approval, and we’ll take it from there!”

• Copyright Report an error

  “© ActiveCampaign, LLC, 2026.”

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