Thank you for your post.
I am unable to replicate the problem on my iPad (iOS 4.2.1) when using the Sample Inventory file that comes with FileMaker Go, and sending it fourteen times. (I added records, found individual records, groups of records, etc.)
Is this internal error only occurring with your database file? Have you tried using the Sample Inventory file and sending an email?
How large is your database file?
Any other information you can provide to replicate the problem would be helpful.
I get an error when I attach an open Filemaker file to a regular email on my computer. Any chance you are attempting to attach a file that is currently open?