email the contents of a txt file

while(<EMAILADDRESSFILE>)
{
   open MAIL, "|mail " . $_;
   print MAIL $heading . $quote;
   close MAIL;
}

I want  $heading . $quote;  to be changed to the contents of a text file.  In other words, I want to have a text file sitting in the directory this script is in, and have that text file contain the body of my mass email, so I would be able to write something like

while(<EMAILADDRESSFILE>)
{
   open MAIL, "|mail " . $_;
   print MAIL [a filename];
   close MAIL;
}

Help! I need a solution quick.