On Fri, 01 Mar 2019 22:09:01 +0000 Rupert Gallagher wrote: > Case study: > > example.com bans any e-mail sent from its third levels up, and does > it by spf. > > spf-banned.example.com sent mail, and my SA at server.com adds a big > fat penalty, high enough to bounch it.
example.com has a TXT record of "v=spf1 -all" spf-banned.example.com has no TXT record at all
