Had this issue yesterday and it cleared up between 2 and 3 AM EST. Not it looks like it is happening again. Started again about 8:30 AM EST today. 421 4.2.1 "Service unavailable. Please try again later." Its delaying 100 + messages to our customers. AOL yesterday told me it was a change to MY rDNS that I had made. Although I have not made any changes in years.
Had this issue yesterday and it cleared up between 2 and 3 AM EST. Not it looks like it is happening again. Started again about 8:30 AM EST today. 421 4.2.1 "Service unavailable. Please try again later." Its delaying 100 + messages to our customers. AOL yesterday told me it was a change to MY rDNS that I had made. Although I have not made any changes in years.