Ok, my bad, I wasn't enough precise in my steps.
In fact the problem happens because I delete / recreate an user group linked to my Active Directory. That happens a lot as I can't force sync with AD when I modify group members.
Steps are the followings :
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1. On my PRTG server, I go to SETUP > NOTIFICATION TEMPLATES.
2. I add a notification template, configure and save it.
3. I go to DEVICE > Racine > NOTIFICATION TRIGGERS
4. I configure my different triggers.
5. I update AD member (on my Active Directory server)
6. I delete user group linked to AD from PRTG server (because I can't use AD synchronization)
Here, my notification template (template #1) for this group is automatically modified (not deleted) because the group does not exist anymore.
7. I create user group linked to AD on the PRTG server. Which is basically the same group I just deleted.
Here, a new default Notification Template is automatically created (template #2)
8. (and here, the problem is me) After few hours, users (of the AD group) told me they are not receiving any mail. So I went to the concerned device group > NOTIFICATION TRIGGERS. I saw that the performed notification template didn't included any user group to send mails ... because it was still template #1. So, I swapped to template #2. And all other triggers using template #1 wasn't modified.
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I believe I just have to delete the automatically new created notification template (template #2). And just modify template #1 everytime I delete/create AD group. So every notification triggers will be updated.
However, I can't wait to see the future AD group synchronization feature to avoid this manipulation :)
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