New UI is still available, but the naming convention is now changed to notify the purpose of using it or what most customers use it for. Was the new UI working in the older versions? Because apart from just enabling trailblazer on port 4431, you need...

This is one of the most sought out feature and one of the hot topics in this forum. ARC is expected to be introduced in 16.5 which is expected to be out by the end of this year. this may be subject to change, but given the importance of having this f...

If the bounce is generated by ESA, few features do support modification to SMTP response code. Explore the mail flow policy as an e.g. and you should see that the response code fields/value can be changed (though I dont see a see a specific use case ...

ETD at the moment supports integration using API and allows a list of API calls to me made. If thats not what you are looking for, then no it probably doesnt.