Exim is complaining about an invalid command line when Majordomo tries to send it a message for delivery.

Take a look at your majordomo.cf file, It should have something that looks like

$sendmail_command = "/usr/lib/sendmail";

and another line like

$mailer = "$sendmail_command -oi -oee -f\$sender";

If you have modified resend (one of the majordomo programs) to use $sendmail_command instead of $mailer you will be calling Exim with no command line arguments.