SpaceX owner and Tesla CEO Elon Musk speaks during a conversation with legendary game designer Todd Howard (not pictured) at the E3 gaming convention in Los Angeles, California, June 13, 2019.SpaceX owner and Tesla CEO Elon Musk speaks during a conversation with legendary game designer Todd Howard (not pictured) at the E3 gaming convention in Los Angeles, California, June 13, 2019.

Managers can be terminated for allowing employees to work remotely if they are not exceptional, according to an email from Musk to employees.

All that is required for approval is that your manager takes responsibility for ensuring that you are making an excellent contribution to the team. It is expected that you have in-person meetings with your colleagues at least once a month.

Musk threatened managers who wouldn't follow his guidelines.

Any manager who makes a false claim that someone reporting to them is doing excellent work or that a given role is essential will be out of a job.

Musk doesn't give guidelines on what constitutes excellent work.

After closing a $44 billion acquisition of Twitter at the end of October, Musk moved to cut half of the company's full-time workforce, amounting to 3,700 jobs, and a large swathe of contractors.

One of Musk's first moves was to reverse the company's previous " work from home forever" policy.

To succeed in an increasingly competitive world, we will need to be extremely hardcore. Working long hours at high intensity will be the result. The only thing that will make a passing grade is exceptional performance.

He preferred in-office collaboration over staying remote if they couldn't make it in. Employees told CNBC they had not been given formal guidance on remote work.

Emails are transcribed by CNBC.

The person is from: Elon Musk.

The team at the social media site.

The time stamp was removed.

The subtitle is "fork in the road."

All it takes is for your manager to make sure that you are making an excellent contribution.

It is expected that you have in-person meetings with your colleagues at least once a month.

And.

The person is from: Elon Musk.

The team at the social media site.

The time stamp was removed.

The subtitle is "fork in the road."

Any manager who makes a false claim that someone reporting to them is doing excellent work or that a given role is essential will be out of a job.