I think that there is no error message because your $! is being reset by the unlink. Using Net::SMTP, you would replace various of the prints with methods from Net::SMTP:
(where ... == the rest of the line)
open (SENDMAIL ...) ==> $smtp=new Net::SMTP("localhost");
print SENDMAIL "HELO ..." ==> (implicit)
print SENDMAIL "MAIL ..." ==> $smtp->mail(...);
print SENDMAIL "RCPT ..." ==> $smtp->to(...);
print SENDMAIL "DATA" ==> $smtp->data();
print SENDMAIL "..." ==> $smtp->datasend(stuff);
print SENDMAIL "." ==> $smtp->dataend();
print SENDMAIL "QUIT" ==> $smtp->quit();
Note that your could replace the data/datasend/dataend chunk with a single data(@msg) call, if you build the text of the message into @msg.
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