Issue "After Plesk retrieves data from log files of web and FTP servers, email the log files to this address" is not e-mailing

[Genisys-Matt]

Server operating system version

Debian 12.10

Plesk version and microupdate number

Plesk Obsidian Web Host Edition Version 18.0.69 Update #3

We've turned the option on, but no e-mails were being sent.

We investigated and found this in the logs:

May 8 06:45:15 statistics_collector[681252]: Log rotation `/opt/psa/logrotate/sbin/logrotate /opt/psa/etc/logrotate.conf -s /opt/psa/var/logrotate.status' failed with code 1.
Stdout:
Stderr:error: cannot execute mail command: No such file or directory
error: mail command failed for /var/www/vhosts/system/api.genisys-systems.co.uk/logs/access_log.processed.1.gz
error: cannot execute mail command: No such file or directory
error: mail command failed for /var/www/vhosts/system/api.genisys-systems.co.uk/logs/access_ssl_log.processed.1.gz
error: cannot execute mail command: No such file or directory
error: mail command failed for /var/www/vhosts/system/api.genisys-systems.co.uk/logs/xferlog_regular.processed.1.gz
error: cannot execute mail command: No such file or directory
error: mail command failed for /var/www/vhosts/system/api.genisys-systems.co.uk/logs/error_log.1.gz
error: cannot execute mail command: No such file or directory
error: mail command failed for /var/www/vhosts/system/api.genisys-systems.co.uk/logs/proxy_error_log.1.gz
error: cannot execute mail command: No such file or directory
error: mail command failed for /var/www/vhosts/system/cartridgehub.co.uk/logs/access_log.processed.1.gz

Does anyone know why is this failing? E-mails are working fine, we have access to them, we can create e-mail accounts for customers, etc.

Cheers.