Email ettiquette - finding fault with Client?

Question

what is the best way to let the email receiver (client) know that there is a fault in the mail they just sent?

Answer 1

unless its imperitive, i dont think you should let them know

Answer 2

It depends upon the fault.

I wouldn't say it straight out, I would write an email back that says:

"Just confirming from previous discussions......."

with all the details as you know them to be. If the client then responds differently, go with what the client wants.