Question 1

How to run Papercut SMTP in Docker for continuous testing?

Accepted Answer

Use the Docker image from Docker Hub with commands like 'docker run -d -p 37408:8080 -p 2525:2525 changemakerstudiosus/papercut-smtp:latest', which sets up the SMTP server on port 2525 and the web interface on 37408. For advanced setups, refer to the Service README for Docker Compose examples and port configurations.

Question 2

Papercut SMTP or MailHog for email testing in development?

Accepted Answer

Papercut SMTP excels with its rich desktop GUI, detailed email inspection, and .NET Aspire integration, ideal for Windows-based teams. MailHog is simpler, cross-platform, and better for lightweight, command-line focused testing without a visual interface.

Question 3

Can Papercut SMTP handle HTML email rendering for testing templates?

Accepted Answer

Yes, it includes an HTML viewer that displays rendered email templates, as shown in the features screenshot, allowing you to debug design and layout without sending emails to real addresses. This is perfect for verifying template correctness during development.

Question 4

How to integrate Papercut SMTP with a .NET Aspire project?

Accepted Answer

Install the NuGet package 'CommunityToolkit.Aspire.Hosting.PapercutSmtp' and configure it in the App Host using builder.AddPapercutSmtp, which automatically assigns ports and exposes a connection string for SMTP client setup. This simplifies local testing in .NET ecosystems.

Question 5

What are the steps to enable TLS encryption in Papercut SMTP?

Accepted Answer

Create a self-signed certificate via PowerShell with New-SelfSignedCertificate, then update appsettings.json with CertificateFindType and CertificateFindValue settings, and set the port to 587 for STARTTLS. The README provides detailed examples for both desktop and Docker deployments.

Question 6

Is Papercut SMTP suitable for testing email attachments in applications?

Accepted Answer

Yes, it supports viewing and downloading attachments, as demonstrated in the MIME sections view, making it useful for testing file uploads and attachment handling in email-dependent features. You can inspect raw bytes and save files locally.

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