Warning: Insufficient Funds!

I use my bank's online banking service to pay almost all of my bills. Each month I get an email telling me when I get a new bill. I have my default setting set to "Pay Account Balance." That works great for my credit card bill. But now I have a mortgage that is also set up this way. I may have to discontinue the e-bill on this one and go back to writing a check, so I can live in ignorant bliss on how much I owe. Just looking at the number makes me want to weep.