I have searched, but I can't find some Email Alerts for Drupal 6 that will do something lke that:
- send emails for any module or core to update
- send emails for any node updated
I hope someone can help me to find them.

Comments

brandon.dixon’s picture

Not sure what you mean by nodes specifically, but this may help for content related updates:
http://drupal.org/project/subscriptions

It has the capability to send out mail updates.

arh1’s picture

for core/contrib updates, enable the (now core) 'update status' module, and adjust the settings at /admin/reports/updates/settings .

for nodes, check out cores triggers + actions. you could, e.g. send an email to the site admin or node author when a node is added/edited.

lastly, there are a number of modules for email notifications of node comments. these days i use comment_notify.