My work has started hounding us to get customer emails. OK, fine, but the registers don't have an option for a customer who's already on our email list. So my choices are A) have the customer give me their email again, knowing they already get our emails, thus wasting their time and risking pissing them off, or B) don't get their email at all, which counts against my percentage and could result in a talking to from my boss (even though they've ALREADY SIGNED UP FOR OUR FREAKING EMAILS!!!)
Use a dummy email when they say they already gave it. Like none(at)nospam. Our store is in Florida but when we have to ask for zip codes (every other month they start that) it annoys the customers so we just all put 90210 when they say they’ve done it.