Interesting note about DMARC, but still, if you're concerned about breaking forwarding for your domain, then why bother using spf at all? I still don't see the benefit of setting up ~all rules.
I believe that DMARC requires SPF. Since I want DMARC, I need to provide a compatible SPF, which means ~all.
(And I do want to implement DMARC. Not so much to improve deliverability of my own email, but rather to prevent delivery of malicious email pretending to be from my domain.)
