Support Tool incorrectly signals successful Support Request creation

Steps to reproduce:

• Create 2GB log file in STASH_HOME/var/log e.g. atlassian-stash-mail.log
• File a Support Request with all options selected except Limit File Size
• UI displays, "Your message regarding "TEST" has been successfully sent. "
• atlassian-stash-mail.log

  2013-02-14 14:39:26,329 ERROR [MailServiceSender:thread-1] admin 877x268x1 bu6869 172.28.12.165 "POST /plugins/servlet/stp/view/create-support-request/execute HTTP/1.1" stash.mail-log Message not sent: Mail sending failed; recipient: stash-autosupportrequests@atlassian.com; subject: TEST
  org.springframework.mail.MailSendException: Failed messages: javax.mail.MessagingException: IOException while sending message;
    nested exception is:
          java.net.SocketException: Broken pipe