Problem sending mail with SparkPost API

[davidebusso]

I configured the plugin by selecting SparkPost and entered all the data. When I try to send a test mail, the mail does not arrive and from SparkPost events it tells me "field 'content.headers' is of type 'json_array', but needs to be of type 'json_object'".

I tried with the same api key to configure it as another smtp and it works fine.

Thank you

[bkno]

Same issue - can confirm it is still a problem.

[DavePodosyan]

Looks like this problem never got addressed