Description of problem:
I want to sent my forgotten login to mail on page /rhn/help/ForgotCredentials.do and I receive Internal server error.

Version-Release number of selected component (if applicable):
spacewalk-java-2.5.14-84.el6sat.noarch

How reproducible:
always

Steps to Reproduce:
1. create new user with valid email
2. go to /rhn/help/ForgotCredentials.do
3. fill email to "Login Information" and click on "send login"

Actual results:
ISE 500

Expected results:
I receive mail in my box

Additional info:
2017-05-12 17:05:42,328 [TP-Processor3] WARN  org.apache.struts.action.RequestProcessor - Unhandled Exception thrown: class java.lang.NullPointerException
2017-05-12 17:05:42,328 [TP-Processor3] ERROR com.redhat.rhn.frontend.servlets.SessionFilter - Error during transaction. Rolling back
javax.servlet.ServletException: java.lang.NullPointerException
	at org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:520)
	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:427)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228)
.........
	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:769)
	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:698)
	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:891)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:690)
	at java.lang.Thread.run(Thread.java:785)
Caused by: 
java.lang.NullPointerException
	at javax.mail.internet.InternetAddress.parse(InternetAddress.java:618)
	at javax.mail.internet.InternetAddress.parseHeader(InternetAddress.java:585)
	at javax.mail.internet.InternetAddress.<init>(InternetAddress.java:100)
	at javax.mail.internet.InternetAddress.<init>(InternetAddress.java:87)
	at com.redhat.rhn.common.messaging.SmtpMail.<init>(SmtpMail.java:80)
	at com.redhat.rhn.frontend.action.help.ForgotCredentialsAction.sendEmail(ForgotCredentialsAction.java:184)
	at com.redhat.rhn.frontend.action.help.ForgotCredentialsAction.lookupLogins(ForgotCredentialsAction.java:166)
	at com.redhat.rhn.frontend.action.help.ForgotCredentialsAction.execute(ForgotCredentialsAction.java:87)
	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425)
	... 40 more
2017-05-12 17:05:42,328 [RHN Message Dispatcher] ERROR com.redhat.rhn.common.messaging.ActionExecutor - java.lang.NullPointerException
java.lang.NullPointerException
	at javax.mail.internet.InternetAddress.parse(InternetAddress.java:618)
	at javax.mail.internet.InternetAddress.parseHeader(InternetAddress.java:585)
	at javax.mail.internet.InternetAddress.<init>(InternetAddress.java:100)
	at javax.mail.internet.InternetAddress.<init>(InternetAddress.java:87)
	at com.redhat.rhn.common.messaging.SmtpMail.<init>(SmtpMail.java:80)
	at com.redhat.rhn.frontend.events.BaseMailAction.getMail(BaseMailAction.java:53)
	at com.redhat.rhn.frontend.events.BaseMailAction.execute(BaseMailAction.java:39)
	at com.redhat.rhn.common.messaging.ActionExecutor.run(ActionExecutor.java:69)
	at com.redhat.rhn.common.messaging.MessageDispatcher.run(MessageDispatcher.java:58)
	at java.lang.Thread.run(Thread.java:785