In the latest build of Smartermail, there are two WYSIWYG boxes for the autoresponder.

One is called "Response to Send to Domain Users" and the other is called "Response to Send to Everyone Else"

When you create an autoresponder in SolidCP, it only fills in the "Response to Send to Domain Users" box and does not fill in the "Response to Send to Everyone Else".

Essentially, the autoresponders created in SolidCP no longer work.

Here is the fix for v1 API: https://mail.smartertools.com/Documentation/api#/reference/SmarterMail.Web.Controllers.SettingsController/SetAutoResponderSettings