Some companies are experiencing what seems like increasing responses from opt-in customers concerning challenge/responses. It is possible for this to be a seasonal or temporary surge depending on how you've been promoting opt-in campaigns.
Exact Target Director of Privacy and Deliverability Al Iverson says:
"We recognize that challenge/response filters exist, but the percentage of users using them is fairly low, and I don't see usage increasing. C/R suffers from a general ineffectiveness and a high false positive rate."
So there's a good chance that it's just an anomaly. But if there is a large increase in this, there are choices you'll have to make on how to handle it.
I know in my email lists, I've had spurts of challenges that I had to deal with. The best thing to do is to communicate to your opt-in customers on the confirmation page that you don't repond to challenge/response messages and that they will need to white-list you in order to get your ezine.
The only other option would be to manually take care of all of the challenges, which can quickly become a nightmare. Again, usually the increase in challenges is connected to a temporary situation that will work itself out.
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