Can our landlord divulge information about our finances to unknown people?
We cannot give legal advice, and are not forming an attorney-client relationship with you. The following is not a substitute for the advice of a local attorney. But we hope the information will be useful.
You may have a lawsuit for defamation. Libel is a written falsehood that harms a person's reputation, broadcast to other people. For a thorough discussion, see:
You will need to contact a local attorney (a plaintiff's attorney, also known as a personal injury attorney), show him or her the email, and discuss the possibility of a lawsuit.