Now and then I will add services or change the way they work.

Network abusers may threaten Petra's security in ways that require a response from all users.

Users will need help or offer help or form teams to run some network service.

I may subscribe you to a low-volume mailing list to tell you about such events. If it becomes obvious you're trashing that mail without reading it, or you stop using your account for many months without notice, I may freeze or remove your account.

You should create a file in your home directory named ".contact" containing instructions for reaching you in the event your email goes bad.