How to send mail using nant targets?

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Hi everyone,

I have to send the mail using nant <mail> targets, but i am getting some errors like this

Error sending mail:
Error enountered while sending mail message.
Make sure that the following information is valid:
Mailhost: smtpclient.everyone.com
Mailport: 80
Use SSL: False
Using default credentials

    Failure sending mail.
        Unable to connect to the remote server

my code is

<target name="send.email">
<mail from="tilak@raj.com" tolist="raj@tilak.com" cclist="tilakraj@tilakraj.com" subject="Test mail" message="Test mail delivered" mailhost="smtpclient.everyone.com" >
<attachments>
   <include name="test.doc" />
</attachments>
</mail>
</target>

please help me to correct this code.....

Thank You
Your's friendly
Tilakraj