Why is AOL Misbehaving?

Lance Hemenway Blog, Delivery

For the last few months, many mailers have had issues delivering to AOL associated to variations of “mtain-df04.r1000.mx.aol.com Service unavailable – try again later.” By definition, these are temporary errors, so they should be retried until you’re able to get through, right? Yes and no, many mailers are not seeing successful delivery by the time their systems expire the message; …