When is it OK to forward an email to someone else?

You have considered whether it would violate the sender’s privacy.

You know the sender won’t find out that you forwarded it.

You have a printed copy of the email.

You have backed up the email first.

It is generally acceptable to forward an email to someone else if the content is not confidential or sensitive, and if it is relevant or useful to the recipient. It is important to exercise discretion and consider the potential implications of forwarding the email before doing so. Additionally, it is always best practice to obtain permission from the original sender before forwarding their email to someone else.