Email technology provider Sendmail has worked with Microsoft to launch a sender authentication plug-in which is hoped will combat email fraud and spam. 60 per cent of the world"s email traffic runs on Sendmail"s commercial and open source mail transfer agent (MTA). The plug-in lets organisations verify a message"s source before accepting it by automatically checking to see if an email came from where it claims it did. Open source versions of its plug-in will be freely distributed, while it will also be integrated in commercial versions of Sendmail"s products.