[Deploying Sakai] Email Issue

[prabhu]

Hi,
         I am trying to send announcement to students through my sakai
portal. but I see they are unable to receive their emails, And on the log
file , I see the below error

*INFO http-8080-Processor14
org.apache.myfaces.shared_tomahawk.config.MyfacesConfig - Starting up
Tomahawk on the RI-JSF-Implementation.
2013-02-04 06:54:31,606  WARN http-8080-Processor15
org.sakaiproject.authz.impl.DbAuthzGroupService - isAllowed(): called with
no realms: lock: asn.read user: 5921f30c-732c-452d-b2e6-01c7abfd9673
2013-02-04 06:54:31,731  INFO http-8080-Processor15
org.sakaiproject.util.CalendarUtil - getLocalAMString()
2013-02-04 06:54:31,825  INFO http-8080-Processor15
org.sakaiproject.util.CalendarUtil - getLocalPMString()
2013-02-04 06:54:32,167 ERROR http-8080-Processor16
org.sakaiproject.announcement.impl.SiteEmailNotificationAnnc -
2013-02-04 06:54:32,936  INFO http-8080-Processor16
org.sakaiproject.email.impl.BasicEmailService - sendToUsers: headers[
MIME-Version: 1.0 Content-Type: multipart/alternative;
boundary="======sakai-multi-part-boundary======" Subject: [ Course
Duplicating 1 -  Announcement ] Test From: "mysakai"<no-reply at mysakai.com>
To: "Course Duplicating 1"<no-reply at mysakai.com>] to[  mysakai at hotmail.com
newmail at hotmail.com]

*--
*
-----------------------------------------------------------------------------------------------------------------------------------------------

*
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://collab.sakaiproject.org/pipermail/production/attachments/20130204/795cef70/attachment.html