Mailbox.org DKIM records

Hey folks,

I’m trying to use the CNAME method for DKIM for mailbox.org (their docs are SPF, DKIM, and DMARC - How to improve spam reputation and avoid bounces | Knowledge Base: Knowledge and help | mailbox ).

However, deSEC won’t let me enter the . in the middle of the required CNAME:

Not sure how to resolve this?

For now I’ll use the TXT records, but it’s not recommended by mailbox.org

Ah, PEBKAC - subname must be lowercase only.