You're missing a newline between the "To:" line and the body: 
if (open (SENDMAIL, "| $sendmailpath -t"))
{
  print SENDMAIL "Subject: $subject\n";
  print SENDMAIL "From: $from\n";
  print SENDMAIL "To: $to\n";
  print SENDMAIL "\n"       ### Need a blank line between headers and 
+body!
  print SENDMAIL "This is a test e-mail.\n\n";
  close (SENDMAIL);

[download]

In addition - use strict, even though it's not the issue here.

Michael

In reply to Re: seeking sendmail enlightenment by mpeppler
in thread seeking sendmail enlightenment by wayan

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