Authentication for e-mail marketing messages is being used by an increasing number of marketers, reports ClickZ.

The report on usage comes from Microsoft, who presented their findings at this week's Authentication and Online Trust Summit. It says Hotmail alone identifies 3.8 billion deceptive e-mails a day. It also says adoption of Sender ID is up three-fold in the last year.

Marketers and the service providers they use for e-mail messaging need to adopt authentication standards both for outgoing and incoming messages. 2007 is expected by some to be the year that authentication really takes off as a valuable tool for e-mail marketers because of the ever-growing spam and scam e-mail problem.