America Online subscribers who are on Yahoo Groups lists are experiencing glitches and have not received any e-mail from the lists since last week.

AOL said Monday that the problem arose late last week when Yahoo did not notify AOL that it had changed its IP addresses on some of its servers, including those that have the Yahoo Groups e-mails. Because AOL was not notified, the company's servers identified the mail coming from Yahoo as spam, or unwanted junk e-mail.