This module allows you to give Dolibarr the ability to “track” / “log” a number of things. It's often “forgotten”, but once it's activated you won't be able to do without it!

For example: on a customer's invoice file, you'll have a list of events relating to this invoice: whether you've already sent it, when, to whom, and so on.

Activate this module and go to its configuration.

• On the 1st page, check the box corresponding to the option “Use event types (managed in the Configuration → Dictionaries → Calendar event types menu)”.
• then in the “Automatic feed” tab, tick all the boxes you want …

Next, so that Dolibarr can periodically start checking the notifications you send, don't forget to activate the scheduled task “Send calendar reminders by email”.

You can do this here: Home > Administrative tools > Scheduled tasks > Send calendar reminders by email …

And if your host doesn't offer you access to cron or a “web” task scheduler, you can use the dolizen one…