It 's all possible.
A script can perform the find for the clients with rates that meet the search criteria. A PDF can be saved and then attached to an email to the loan officer. You can perform 1 find for each loan officer where you specify both the officer and the rate.
A script on how to save as PDF using a $path variable: Found Sets to PDF with unique file names
The same $Path variable can be entered as the attachment in order to attach the PDF to the email.
It's also possible to list:
Client 1 Name, 5%
Client 2 Name, 4.5%
Client 3 Name, 4.25%
Client 4 Name, 6%
in the Body of the email--it especially easy to do in FileMaker 13 using the new "List of" summary field.