Send and receive
Work with outbound email and inbound replies through the same inbox APIs.
A Postmark alternative that follows the whole message.
Build email workflows with inboxes, replies and automated checks in MailSlurp. Keep the received message available when the next step matters.
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Give every workflow an address of its own.
Create real email addresses in the dashboard or through the API. Receive replies, inspect messages and organize inboxes around your customers, applications and test environments.
Use MailSlurp domains or connect your own domain. Choose inbox lifetimes and retention settings to suit the workflow.
Explore programmable email
React to incoming messages
Use webhooks to notify your app when an email arrives, then retrieve its content and attachments.
Inspect what was delivered
Open the received message, headers and raw content when a workflow needs debugging.
Keep the received message within reach.
Look beyond the send event. Open an email in the dashboard, inspect its final content and use the API to retrieve the fields your application needs.
For invoices, orders and support messages, add AI extraction to turn email and attachment content into structured records.
Turn incoming email into data
Test the send before your customers depend on it.
Pair your email workflow with inbox placement testing, domain checks and device previews. Check where a test lands and how the message looks before releasing a new template or changing a sending service.
Check inbox placement
How to bring a workflow into MailSlurp
Create an inbox and connect your app
Start with an address in the dashboard, then use the MailSlurp API and SDK guides to create and manage inboxes from your application.
Send a representative message
Test the confirmation, receipt or reply your app depends on. Inspect the delivered email and verify any domain settings required for your sending path. Plans show the current sending allowances.
Automate the next action
Configure a webhook or wait for the expected email through the API. Check the content, extract the data you need and continue the workflow with a repeatable test.
Test the receipt and the reply.
Follow the message and its reply
An invoice email can start a conversation. Use MailSlurp to receive the delivered message, inspect the attachment and route an incoming reply to your application through a webhook.
Try your streams, routes and attachments
When evaluating a Postmark alternative, map the message streams and inbound routes your app relies on. Try a receipt, a password reset and a reply with an attachment. Check the application outcome before expanding the migration. The Postmark alternatives guide includes the transactional messages to evaluate first.
Questions before you switch?
How do I test a receipt and the reply it receives?
Send a receipt to a controlled MailSlurp inbox and inspect its recipient, order reference and attachment. Reply to the message, then check that your application receives the inbound event and retrieves the reply content. Keep both messages available while you verify the order or support record they should update. Build a send-and-reply check.
Can I receive replies and attachments?
Yes. Create an inbox, receive email and retrieve its content, headers and attachments through the API. Use webhooks when your application needs to react to incoming messages.
How do I evaluate a migration?
Map your existing send requests, inbound routes and event handling. Try one complete workflow with a representative message and reply, check domain configuration and current plan allowances, then expand after the first flow works.
Bring your next email workflow into MailSlurp.
Start with an inbox, a real message and the next action your app needs.
