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Test e-mails in development

This guide is meant for users that are in development and need to test e-mails receival / sending.

Step 1 - run a local SMTP server

First, install a tool that runs a local SMTP server for testing purposes. This tutorial will use MailHog.

If a system is not listed below, check the original documentation on how to install MailHog.


brew update && brew install mailhog

Docker version

docker run --restart unless-stopped --name mailhog -p 1025:1025 -p 8025:8025 -d mailhog/mailhog

Note that, by default, MailHog uses the following ports:

  • SMTP server runs in port 1025
  • HTTP server runs in port 8025.

Validate that MailHog is running by accessing its HTTP server in (or the configured HTTP server port).

Step 2 - enable e-mails for development

In development, e-mail sending is disabled by default and the application must be configured for e-mails to be sent.

Enable e-mail sending

E-mail sending is configured using the config MAIL_SUPPRESS_SEND. It must be set to False for e-mails to be sent to the configured SMTP server.

If set to True, e-mails are printed in stdout instead of being sent to the configured mail server.

Configure the application by editing the app's invenio.cfg:

code src/my-site/invenio.cfg
# Allow e-mails to be sent.

# Configured SMTP server's host

# Configured SMTP server's port
MAIL_PORT = 1025 

Restart the application and e-mails will be sent to the configured SMTP server.

Check the inbox in MailHog UI.

Further reading