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Check Geronimo console System Modules for a component name beginning with org.apache.geronimo.configs/javamail. This module is present and started by default in the javaee5 instances of the server (both jetty and tomcat).

If, for some reason, the module is not started or not present then you can start the module via:

Use the Web Console: Applications > System Modules > Click 'Start' link beside the JavaMail module ID (you may have to enable expert mode)

Use command line deployer:

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cd <geronimo_home>\bin
java -jar deployer.jar --user system --password manager start org.apache.geronimo.configs/javamail/2.X/car

Stop the server. Modify <geronimo_home>\var\config\config.xml and set JavaMail module load attribute to 'true':

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...
<module load="true" name="org.apache.geronimo.configs/javamail/2.0-SNAPSHOT/car">
    <gbean name="SMTPTransport">
        <attribute name="host">localhost</attribute>
        <attribute name="port">25</attribute>
    </gbean>
</module>
...

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sendmail.war
  + index.jsp
  + WEB-INF
    + web.xml
    + geronimo-web.xml

web.xml:

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title	web.xmlxml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
        version="2.4">
    <display-name>Send Mail Webapp</display-name>
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>
    <resource-ref>
        <!-- Used in index.jsp -->
        <res-ref-name>mail/testMailSession</res-ref-name>
        <res-type>javax.mail.Session</res-type>
        <res-auth>Container</res-auth>
        <res-sharing-scope>Shareable</res-sharing-scope>
    </resource-ref>
</web-app>

geronimo-web.xml: This deployable is using Geronimo 2.0's JavaMail component, so it needs to specify where to look. It does this under the <dependencies> tag. As Geronimo changes, these paths need to be changed accordingly to ensure that it refers to the same things. Under the <resource-ref> element, it is referring to a JavaMail session. This is what allows the developer to reference resources that resides on the server. The <ref-name> element is used in the web.xml so the two must be consistent. The <resource-link> element specifies the default Geronimo mail session.

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	xml
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title	geronimo-web.xmlxml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://geronimo.apache.org/xml/ns/j2ee/web-1.1">
    <environment>
        <moduleId>
            <groupId>${pom.groupId}</groupId>
            <artifactId>${pom.artifactId}</artifactId>
            <version>${version}</version>
            <type>war</type>
        </moduleId>   
        <dependencies>
            <dependency>
                <groupId>org.apache.geronimo.configs</groupId>
                <artifactId>javamail</artifactId>
                <type>car</type>
            </dependency>
        </dependencies>
    </environment>
    <context-root>/sendmail</context-root>
    <resource-ref>
        <!-- Used is web.xml -->
        <ref-name>mail/testMailSession</ref-name>
        <!-- Default Geronimo mail session -->
        <resource-link>mail/MailSession</resource-link>
    </resource-ref>
</web-app>

index.jsp:

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title	index.jspxml

<%@page import="java.util.Date,
                javax.mail.Message,
                javax.mail.Session,
                javax.mail.Transport,
                javax.mail.internet.InternetAddress,
                javax.mail.internet.MimeMessage,
                javax.naming.InitialContext" %>

<%
    String resultMsg = "";
    String action = request.getParameter("action");
    if ("Send".equals(action)) {
        String from = request.getParameter("from");
        String to = request.getParameter("to");
        String subject = request.getParameter("subject");
        String content = request.getParameter("message");

        // Get mail session and transport
        InitialContext context = new InitialContext();
        // Mail session from web.xml's resource reference
        Session mailSession = (Session) context.lookup("java:comp/env/mail/testMailSession");
        Transport transport = mailSession.getTransport("smtp");
    
        // Setup message
        MimeMessage message = new MimeMessage(mailSession);
        // From address
        message.setFrom(new InternetAddress(from));
        // To address
        message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
        // Subject
        message.setSubject(subject);
        // Content
        message.setText(content);
    
        // Send message
        transport.connect();
        transport.send(message);
        
        // Build result message
        resultMsg = "<b>Result:</b>";
        resultMsg += "<br>Message sent: " + new Date();
        resultMsg += "<br>To: " + to;
        resultMsg += "<br>From: " + from;
    }
%>

<html>
    <head>
        <title>Send Mail</title>
    </head>
    <body>
        <form>
            <table>
                <tr>
                    <td align="center" colspan="2"><b>Send Mail</b></td>
                </tr>
                <tr>
                    <td align="right">From:</td>
                    <td><input type="text" name="from"></td>
                </tr>
                <tr>
                    <td align="right">To:</td>
                    <td><input type="text" name="to"></td>
                </tr>
                <tr>
                    <td align="right">Subject:</td>
                    <td><input type="text" name="subject"></td>
                </tr>
                <tr>
                    <td align="right">Message:</td>
                    <td><textarea rows="5" cols="20" name="message"></textarea></td>
                </tr>
                <tr>
                    <td align="right" colspan="2">
                        <input type="submit" name="action" value="Send">&nbsp;<input type="reset"></td>
                    </td>
                </tr>
            </table>
        </form>
        <%= resultMsg %>
    </body>
</html>

...

Fill up the form (From, To, Subject, Message fields) and click 'Send' button. You should get a similar message if the mail was sent successfully:

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Result:
Message sent: Fri Dec 15 01:10:05 PST 2006
To: manny@pacquiao.com
From: chris@cardona.com

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