If you don't want to use a module, the simplest way of e-mailing to user@host.com is by calling:

sub Mail
{
    my ( $Msg ) = @_;
    my $Hdr = "From:  Speaker to Users\n".
          "To:    <user\@host.com>\n".
          "Subject: End of Day problems\n\n";

    open( SENDMAIL, "|/usr/lib/sendmail -oi -t -odq")
       or die( "Can't fork for sendmail: $! \n" );

    print SENDMAIL $Hdr.$Msg;
    close(SENDMAIL) or warn "sendmail didn't close correctly!";
}
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