We've had this problem and finally figured out. When attaching files to email, the naming convention used could prevent mail from being sent. If the file name has a slash / anywhere in the name, Netscape would try to use that as a url for the file, such as "file:/name of file/jobnumber.pdf" and could not send. Chaning the naming convention to underscores or dashes fixed the problem.
Hope this helps.
Max
Hope this helps.
Max