I am like many of you and have been the only billing person, however was taught that there absolutely needs to be a separate person opening the mail and posting it, as well as reconciling the monthly bank statement, that is in the incidence that the billing office consists of one person. In my situation the office manager opened the mail, she kept a list of checks and amounts, I had to balance with her and then our lists together had to match the bank statement. I suppose it depends upon the office, but always protect yourself from the appearance of wrongdoing, I agree with the above comments. Good luck. By the way, i was never told it was illegal, it was not a good accounting practice.