Mailpit

Mailpit

Email testing tool & API for developers: catch all mail in a web UI

emailtestingsmtp
— GitHub StarsOfficial documentation Source repository

≈ $23/moAbout 10 minutes Resources are created in your AWS account

Screenshot from verification · Click to enlarge

v1.31.2 · Verified just now

Application tests passed; AWS environment evidence comes from the referenced platform verification.

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Quick Deploy

Use the recommended configuration, or customize it below.

Recommended configuration

Estimated≈ $23/mo
Version
v1.31.2
AWS Regions
us-east-1
Instance
t3.small
Persistent data volume
30 GB
Customize configuration

Change the version, region or resources. Larger resources have not been verified separately.

This exact configuration is verified; the image digest is pinnedTechnical details
Opens CloudFormation in your AWS account
Deployment steps and post-deploy actions

After you deploy

  1. The CloudFormation wizard opens with everything prefilled (stack "corenova-mailpit-v1-31-2") — review and click "Create stack".
  2. Wait until the stack status reaches CREATE_COMPLETE (about 10 minutes). Outputs are only visible after completion.
  3. Open the stack's Outputs tab — everything you need is there:
    • ResolvedLaunchUrlAccess URL — open this in your browser
    • PublicIpThe instance's public IP
    • PublicDnsNameThe instance's public DNS name
  4. Open the access URL in your browser — the app is ready to use.
  5. Admin console — Open your access URL followed by this path: /

    The web inbox at / is open; point applications' SMTP at the instance's port 1025 to capture mail. No preset credentials.

Good to know

  • SMTP listens on container port 1025 (the CFN security group opens it); the web UI/API on 8025.
  • Mail lives on a retained volume (/data, SQLite). It keeps billing after stack deletion; snapshot it, then delete the volume when no longer needed.

Next steps

  • Your data lives at /data inside the container, on an encrypted EBS volume. Find the instance by its ID in the EC2 console.
  • Back up before any changes: Upgrading and backups guide
  • To upgrade to a newer verified version: Version history

Deleting the stack terminates the host, but the data volume is retained and continues billing. Snapshot it first, then delete the retained volume manually when you no longer need it.

Verification evidence is bound to the one-click template revision f14bc41 · View template

Versions

View full version history
VersionsVerified AtVerifiedStatusAWS Tested
v1.31.2Sep 19, 2026 VerifiedSecurity UpdateAWS · referenced

Technical information

Container port8025
Supported Architecturesx86_64
AMIami-025d99823a4caad37
Container imageaxllent/mailpit:v1.31.2

FAQ

How do I access Mailpit after deployment?

After the CloudFormation stack reaches CREATE_COMPLETE, open ResolvedLaunchUrl in the stack Outputs. The web inbox at / is open; point applications' SMTP at the instance's port 1025 to capture mail. No preset credentials.

Where are application data and credentials stored?

Application data is stored at /data inside the container on the retained encrypted EBS data volume. SMTP listens on container port 1025 (the CFN security group opens it); the web UI/API on 8025.