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Greenmail Plugin for Grails

  • Authors: Grails Plugin Collective
6 votes
compile "org.grails.plugins:greenmail:1.3.4"
Custom repositories:
mavenRepo ""



Provides a wrapper around GreenMail ( and provides a view that displays 'sent' messages


Greenmail Plugin

Provides a wrapper around GreenMail and provides a view that displays 'sent' messages - useful for testing application in the 'development' or 'test' environments.

Please create issues in JIRA if you encounter problems.


grails install-plugin greenmail

The plugin assumes that you have some sort of Java mail provider installed (for instance the Grails mail plugin). You need to define a SMTP port for the mock Greenmail SMTP server to start with. Using the Grails Mail plugin, this is as simple as defining the grails.mail.port property in Config.groovy, like this (see the first line in the 'development' and 'test' blocks):

environments {
    production {
        grails.serverURL = ""
    development {
	grails.mail.port = com.icegreen.greenmail.util.ServerSetupTest.SMTP.port
        grails.serverURL = "http://localhost:8080/${appName}"
    test {
	grails.mail.port = com.icegreen.greenmail.util.ServerSetupTest.SMTP.port
        grails.serverURL = "http://localhost:8080/${appName}"

You can also completely disable the plugin by using the config setting greenmail.disabled = true. For example, to disable greenmail in production:

environments {
    production {

Usage in Integration Tests

The plugin can be used to capture email messages during integration tests. For example:

import com.icegreen.greenmail.util.*

class GreenmailTests extends GroovyTestCase { def mailService def greenMail

void testSendMail() { Map mail = [message:'hello world', from:'[email protected]', to:'[email protected]', subject:'subject']

mailService.sendMail { to from mail.from subject mail.subject body mail.message }

assertEquals(1, greenMail.getReceivedMessages().length)

def message = greenMail.getReceivedMessages()[0]

assertEquals(mail.message, GreenMailUtil.getBody(message)) assertEquals(mail.from, GreenMailUtil.getAddressList(message.from)) assertEquals(mail.subject, message.subject) }

void tearDown() { greenMail.deleteAllMessages() } }

The plugin adds a deleteAllMessages() convenience method to the greenMail bean that deletes all received messages.

Usage in running application

The plugin provides a controller and view to show messages that are 'sent' from the application. Simply browse to http://localhost:8080/<YOUR_APP>/greenmail and it will show a list of messages sent. You can click on the "show" link to view the raw message.

Email List screen:

Raw Message example:

Roadmap: This is a fully functional plugin, though there are some features that I think would be worth adding. Contributions and patches are welcome! Create a JIRA ticket with a patch or request plugin developer access and make the change directly in the SVN plugin repository (an email to the author is appreciated)

  • Messages sent by the Grails Mail plugin have duplicate "TO:" fields in the raw message and in the address list, for instance if the recipient is [email protected], then that email address is listed twice when you retrieve the address list for RecipientType.TO (e.g. GreenMailUtil.getAddressList(message.getRecipients(javax.mail.Message.RecipientType.TO))
  • Ability to view HTML email messages as they appear in a mail client rather than as RAW message.