The smtplib.py also has the same problem.
The EINTR cannot be handled properly.
2014-05-21 19:20:15,631 ERROR actions: Notification 'socket_noti' FAILED to send emails to set(['mailtest@tscoss.com']): <class 'socket.error'> - [Errno 4] Interrupted system calltrace:Traceback (most recent call last):
  File "Utils.py", line 719, in sendEmail
    server = smtplib.SMTP(host, port, timeout=DEFAULT_SOCKET_TIMEOUT)
  File "/opt/zenoss/lib/python2.7/smtplib.py", line 242, in __init__
    (code, msg) = self.connect(host, port)
  File "/opt/zenoss/lib/python2.7/smtplib.py", line 302, in connect
    self.sock = self._get_socket(host, port, self.timeout)
  File "/opt/zenoss/lib/python2.7/smtplib.py", line 277, in _get_socket
    return socket.create_connection((port, host), timeout)
  File "/opt/zenoss/lib/python2.7/Write failed: Broken pipecreate_connection