Make sure your default mail client is Apple's Mail. I had this issue when Google Chrome was my default email client.
I assume you have not saved your electronic upgrades.
Do you have the last Filemaker 12 upgrade?
If not you can redownload it and previous versions here
I suggest you save electronic installers and your serial numbers and passwords in a safe place and then back them up.
When I set Mail as the default, the functions works. Thanks, Kenneth. So is this a bug or by design? Why can’t Filemaker use other email clients?
For Why, you'd have to ask a programmer that works for FileMaker Inc.
From the help file for FileMaker 12:To send email, you must have an internet connection. In addition, to send mail through an email application, you must have the following configurations.Windows:•A [Mail] section in the Win.ini file.•Microsoft Exchange, Microsoft Outlook, Microsoft Outlook Express and Eudora installed and configured properly.Mac OS:•Mac OS X Mail or Microsoft Entourage installed to send email with FileMaker Pro.•Internet system preferences configured for use with one of the supported mail applications.•If you use Eudora 5, start the Eudora application before performing this script step.