mailman3-notify.timer

[Unit]
Description=GNU Mailing List Manager 3 / run daily: mailman3-notify.service

# run only if main service is running
PartOf=mailman3.service
After=mailman3.service

[Timer]
OnCalendar=*-*-* 04:00:00
RandomizedDelaySec=3600
#FixedRandomDelay=true
Persistent=true

[Install]
WantedBy=timers.target mailman3.service