EFX - eFax Document
This is a document file created by the eFax service that sends and receives faxes. They are sent and received as document attachments by email and will contain the body text as well as the attachment. It can be converted into PDF or TIF files with eFax Messenger. These documents may also be converted to over 50 different types of file types with the eFax software including XLS, DOC and JPG. Services provided by eFax are available in Corporate, Pro and Plus versions.