Hm, still don’t get it.
I’ve registered jiratimesheet.com sending domain, and would like to send email from email@example.com, but I get same error (Unconfigured Sending Domain). I feel like there could be an option to specify sending domain when sending email via REST, but I can’t find it. And same problem using SMTP.
I have managed to send mail from firstname.lastname@example.org though, and it shows as
email@example.com via sparkpostmail1.com.
I would like it to get something like
firstname.lastname@example.org via jiratimesheet.com working at least.
Well, I think I will end up with emails from
email@example.com, that’s not bad either.
Thank you a lot for your suggestion and attention.