I originally FTP'd and installed the binaries for Linux and found the following problem when I run sendfax:
/usr/local/sbin/textfmt ... blaah blaah blaah ... No Font Metric Information found for "Courier-Bold"...
The HylaFAX client programs expect AFM files in a specific directory. This directory is defined at build time with the AFM configuration parameter (look at config.site or the HTML documentation), displayed during the configure procedure and you can alter it through the prompts. After configure has run, the value of AFM is set in the defs file that is generated.
If the above information is not what you were looking for then you might look for other reasons why textfmt cannot locate a file called "Courier-Bold" in the AFM directory--perhaps the permissions on the file are setup incorrectly?