Copied from a Belgium forum (www.clarify.net)
I had the same problem (FileMaker 9 crashing on a Send mail script step) with several computers running Windows XP. Apparently the cause of the problem was the missing [Mail]-section within the win.ini file.
Adding the following section to my win.ini file did the thing:
Thank you for this hint. That was the solution for the same problem I got on a win xp machine as described above.
Thanks a lot.