Dear

In response to your request for verification of employment
for (name of applicant) , our records indicate that
(s)he worked for us from (date) to (date)

The position that (name of applicant) held with
our firm was (position)

This is all of the information I am able to provide to you
inasmuch as it is against our company policy to offer
comments in regard to a previous employee’s quality of work
during employment with our firm.