Is the email originating from iris_murdoch@yahoogroups.com titled "need confirmation" spam?

The email referred to originates from the same address as the Iris Murdoch group address. In terms of written English it is almost unintelligible having around thirty or so spelling and grammatical errors. It looks like the messages which carry viruses when you click on the web address contained therein. How can someone other than Yahoo use the Yahoo Groups email address?