Got it figured out!
The DNS entry they told me for the “Name” was “mailjet._abcdef”, what I needed to do was add .forum to the end of it because that’s the subdomain I wanted. So ““mailjet._abcdef.forum”.
Thanks for your help 
Got it figured out!
The DNS entry they told me for the “Name” was “mailjet._abcdef”, what I needed to do was add .forum to the end of it because that’s the subdomain I wanted. So ““mailjet._abcdef.forum”.
Thanks for your help