We are in the process of going from APM to APR and our APM just went down. We are getting the error
Processing of batch 240471 failed with the following error: -2147220975 - The message could not be sent to the SMTP server. The transport error code was 0x800ccc67. The server response was 421 4.3.2 Service not available
Processing batch 240471
We have adjusted our outlook server and nothing is working. Ideas anyone?