Simply delete the email... You don't mention the file extension of the attachment you received, or who you received it from....but basically, if you're not COMPLETELY sure who, or where the attachment came from, our general recommendation is to make it go away.
Hope this helps.
My work was carelessly dumping metal dusts and pollutants behind one of our shops. I called environmental control and sent the president an email using the Tor network. one of the replies I received contains an attachment. I can only assume they would try to get my real ip, Any advise on opening the attachment while remaining anonymous? If you care: they cleaned everything up first thing this morning and I dont see them risking to do this again. Thank you in advance for any help.