I appreciate your reply, however the work-arounds you refer to do not work in the subject line of the email.

The subject line (when sending out the estimate that has been renamed "quote") has an error message that says the word "estimate" must  remain in the subject line.  I am not sending an estimate.  I am  sending a document now renamed "quote". I'd like the subject line to reflect that it is a quote and not an estimate.