3 ms·
Yes true, there is SPF and DKIM which are used by the big providers, though I'm not sure how strongly they trust those, but they shouldn't be using IP as a sign
by grey-area 11y ago
Yes true, there is SPF and DKIM which are used by the big providers, though I'm not sure how strongly they trust those, but they shouldn't be using IP as a signal to determine whether the server is legitimate, or it leads to the catch 22 this article talks about - unknown IP = SPAM.