Will DKIM be implemented in future versions of Mercury?

I have SPF and DMARC setup for my domain but after having to help a client recently with DKIM setup in GoDaddy for their Office 365 mail it got me wondering about DKIM support in Mercury.

I could be wrong, but I think DKIM is basically a dns entry and a key added to outgoing email headers. Maybe the key can be added with rules?

Part of the DKIM header is a hash of the email body. I don't think rules can do that.

Regards,
Tony