Sending mail through JNDI mailserver fails - NamingException - MailSessionFactory missing

An error has occurred with sending the test email:
com.atlassian.mail.MailException: javax.naming.NamingException: Could not create resource factory instance 
[Root exception is java.lang.ClassNotFoundException: org.apache.naming.factory.MailSessionFactory]
	at com.atlassian.mail.server.impl.SMTPMailServerImpl.send(SMTPMailServerImpl.java:179)
	at com.atlassian.jira.web.action.admin.mail.SendTestMail.doExecute(SendTestMail.java:88)
...
Caused by: javax.naming.NamingException: Could not create resource factory instance
   [Root exception is java.lang.ClassNotFoundException: org.apache.naming.factory.MailSessionFactory]
	at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:131)
	at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304)
	at org.apache.naming.NamingContext.lookup(NamingContext.java:792)
	at org.apache.naming.NamingContext.lookup(NamingContext.java:139)