Description of problem:
If, for whatever reason, the localhost mail server is down/malfunctioning, a user trying to register is presented with the "We're Sorry ... Invalid Transaction" page.
In the event of a mail send failure, it should display an inline "The system is on fire! Please contact the administrator!" error.

Version-Release number of selected component (if applicable):
3.0.3

How reproducible:
Moderate always

Steps to Reproduce:
1. sudo service postfix stop
2. Go to localhost:port/zanata/account/register
3. Fill out and Submit

Actual results:
Exception screen

Expected results:
Something else

Additional info:
Caused by: javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
  nested exception is:
	java.net.ConnectException: Connection refused
	at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1972) [mail-1.4.5-redhat-1.jar:1.4.5-redhat-1]
	at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:642) [mail-1.4.5-redhat-1.jar:1.4.5-redhat-1]
	at javax.mail.Service.connect(Service.java:295) [mail-1.4.5-redhat-1.jar:1.4.5-redhat-1]
	at javax.mail.Service.connect(Service.java:176) [mail-1.4.5-redhat-1.jar:1.4.5-redhat-1]
	at javax.mail.Service.connect(Service.java:125) [mail-1.4.5-redhat-1.jar:1.4.5-redhat-1]
	at org.jboss.seam.mail.ui.UIMessage.encodeEnd(UIMessage.java:167) [jboss-seam-mail-2.3.1.Final.jar:2.3.1.Final]
	... 106 more