I received this email from out listsersv provider

We emailed you recently about the problems mailing list providers have had in dealing with Yahoo's recent policy changes.

We are pleased to announce that we have now implemented a workaround, which will allow Yahoo account holders to continue to use our mailing lists. In a nutshell, we will change the "from" email address of any Yahoo sender to a dummy address, and then insert a warning as well as the original email address into the body of the message. We also add a "reply to" email address if one does not already exist.

Full details are in our blog - we would be pleased to hear any feedback you have.