Just wondering if anyone knows if we can adjust or add to the default sentence that gets added to emails when a task has Approval by Email turned on?

The current information is basic enough but I have a customer requesting an even more basic change.  They want something put in telling the end user not to use punctuation when they respond.  We had a user test it and reply with Approve. (with the period) and it came back as an invalid response.

I can add a line into the body of the email but that line would be separated from the instructions and I fear the end users are not reading the whole email anyway since the reply by email line is at the top of the email.

Any thoughts on this would be greatly appreciated.

Thanks
Jennifer