The proper response depends on the sender. With friends, ask to be removed from their bulk email list. If they continue to send the emails, put the email addresses on your spam filter. Anyone who wonders why their emails to you no longer get through can be told, “You may want to check the content of the emails you’re sending. My email program is set up to block emails with objectionable content such as foul or sexual language.” With family, you can say, “Please don’t send me these jokes anymore. I find them upsetting.” Co-workers, though, are a special case. Any employee sending emails containing bigotry or sexual language through the office email system is committing a serious breach of professional ethics. You might first talk to the person privately and say, “Could you please remove me from your bulk email list? I’m uncomfortable receiving non-work-related emails at my work email address.” That constitutes fair warning to stop. If the warning is not heeded, ask your supervisor for assistance.