In my cron emails for In my cron email for Cron <root@koha> koha-foreach --chdir --enabled --email /usr/share/koha/bin/cronjobs/process_message_queue.pl: Use of uninitialized value $mail{"Subject"} in concatenation (.) or string at /usr/share/perl5/Mail/Sendmail.pm line 394. Use of uninitialized value $mail{"Subject"} in concatenation (.) or string at /usr/share/perl5/Mail/Sendmail.pm line 394. All of the messages in message_queue in the database appear to have a subject.