1. Add the following to your web.xml file (insert it just before </web-app>): 
    <resource-ref>
    <description>Test description</description>
    <res-ref-name>mail/Session</res-ref-name>
    <res-type>javax.mail.Session</res-type>
    <res-auth>Container</res-auth>
</resource-ref>
  2. Add the following to your server.xml file (anywhere inside the <context ...> tags)
    For Tomcat 5.0.x
    <Resource name="mail/Session" auth="Container" type="javax.mail.Session"/>
<ResourceParams name="mail/Session">
    <parameter>
      <name>mail.smtp.host</name>
      <value>mail.example.com</value>
    </parameter>
    <parameter>
      <name>mail.smtp.port</name>
      <value>25</value>
    </parameter>
</ResourceParams>
    For Tomcat 5.5.x and Tomcat 6.x
    <Resource name="mail/Session" auth="Container" type="javax.mail.Session" mail.smtp.host="mail.example.com" mail.smtp.port="25" />

    To use the TLS protocol, add the property mail.smtp.starttls.enable="true" to this configuration.

    You only need to specify the mail.smtp.port parameter if you are using a non-standard port for SMTP.
  3. Restart the server. Go to create SMTP mail server screen. For JNDI location, enter: 
         java:comp/env/mail/Session

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