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

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.)