Recent 2 weeks, there is a huge increase of macro virus trending and spreading through Microsoft Word attachment.
The virus is spreading fast worldwide. It is spreading from multiple source with multiple subject and sender email address. The virus is not spreading from your server, but from external sources using your UserID and Password.
Once the attachment is open, it will activate the macro process, stealing your outlook password and transmit to remote spammer. The spamming activities will in turn cause your mail server to be blacklisted.
Webmail user are not affected, but for outlook user, do take extra caution.
It is best to turn off your Macro if you are not using it.