How to use pipe to send email to $3 in a awk script

[hk08904]

Hi, everybody,

Now I have a file1 including:
fname:lname:email address(like xxxx@yahoo.com)

I want to email all users a message, the message is saved in file2.

I wrote:
nawk 'BEGIN{ FS=":"; n=1;
while (getline < &quot;file2&quot; > 0)
form[n++]=$0 }
{ print &quot;Dear &quot;$1,$2&quot;:&quot; | &quot;mail $3&quot;
for ( i=1; i<n; i++)
{ msg=form
print msg | &quot;mail $3&quot; }
}' $file1

But &quot;mail $3&quot; doesn't work.
How can I pass the value of $3 into unix command in the awk script.

Could any body help me.

Thank you very much.