On Tue, Dec 07, 2021 at 07:55:54PM +0800, Piper H <pott...@gmail.com> wrote:
> I sent an email from my t-online.de account to gmail. > Gmail shows SPF pass by best guessing: > > Received-SPF: pass (google.com: best guess record for domain of > x...@t-online.de designates 194.25.134.18 as permitted sender) > client-ip=194.25.134.18; > > And t-online.de has no SPF setup for which you can check from their domain. > So what's the best guess record by google? > > Thanks in advance. > Piper Just guessing of course, but it's probably the fact that the host name of 194.25.134.18 is mailout04.t-online.de whose parent domain (t-online.de) matches sender domain. They might also accept the sender domain's MX hosts, regardless of their domain name. cheers, raf
