SPF authentication only, no dkim just yet. As domain controller owner we have
issue with multiple third party application email senders, which fail
specifically our spf authentication. with too many third party email
applications that overwhelms our spf records. Since these application email
pr
Implement DKIM with as many of your third parties as possible. Most have
now realised that they can do their own key-rotation if they simply
specify two CNAME records for you to put into your zone file (rather
than issue you a key, or have you issue them one). Third-party SPF will
generally not
