I was able to reproduce this issue.
It appears the spring-context-support-2.5.5.jar is not part of the classpath libraries. I have entered a JIRA to get this added to the GA release.
To resolve, obtain the spring-context-support-2.5.5.jar, and add it to the MyEclipse Project Capabilities via Window > Preferences > MyEclipse > Project Capabilities > Spring > Spring 2.5 tab > Spring 2.5 Core Libraries
For future reference to others, the error is:
Caused by: java.lang.ClassNotFoundException: org.springframework.mail.javamail.JavaMailSenderImpl
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1358)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
at org.springframework.util.ClassUtils.forName(ClassUtils.java:211)
at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:385)
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1138)
… 33 more