The FaxMaker web client printer allows printing of a document and sends it to the web client as an attachment. In some builds prior to 20.2, this feature would allow the attachment to be sent to the web client but when send is selected, the fax is not sent. This article provides instructions for resolving this issue.
This issue was fixed in build 20.2 and an upgrade to this build or higher will resolve the issue. Please see the How to Upgrade FaxMaker article for more information.