What is no MTA installed

Oct 31 16:55:01 elk02-logstash02 CRON[29696]: (root) CMD (/opt/ELK/UCC/pipelineHealthCheck/testprocess.sh)
Oct 31 16:55:01 elk02-logstash02 CRON[29695]: (CRON) info (No MTA installed, discarding output)
Oct 31 16:59:06 elk02-logstash02 systemd-timesyncd[988]: Timed out waiting for reply from 91.189.89.198:123 (ntp.ubuntu.com).
Oct 31 16:59:16 elk02-logstash02 systemd-timesyncd[988]: Timed out waiting for reply from 91.189.91.157:123 (ntp.ubuntu.com).
Oct 31 16:59:27 elk02-logstash02 systemd-timesyncd[988]: Timed out waiting for reply from 91.189.89.199:123 (ntp.ubuntu.com).
Oct 31 16:59:37 elk02-logstash02 systemd-timesyncd[988]: Timed out waiting for reply from 91.189.94.4:123 (ntp.ubuntu.com).
Oct 31 17:00:01 elk02-logstash02 CRON[30049]: (kadmin) CMD (/opt/ELK/UCC/CDB_tmp_trl/ftppythontrl.py)
Oct 31 17:00:01 elk02-logstash02 CRON[30051]: (root) CMD (/opt/ELK/UCC/pipelineHealthCheck/testprocess.sh)
Oct 31 17:00:01 elk02-logstash02 CRON[30048]: (CRON) info (No MTA installed, discarding output)
Oct 31 17:00:01 elk02-logstash02 CRON[30047]: (CRON) info (No MTA installed, discarding output)

That's the OS saying it cannot generate an email about the cron job. I think it's pretty safe to ignore.

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