Paul Robinson wrote:
I'm pretty new to SPF (about to deploy), but I couldn't find anything in the
archives or on the website that explains how I'm supposed to handle backup MXes
in the context of SPF. I'm sure I'm missing something obvious, but if I'm not,
SPF is undeployable...
The reference implementation of SPF (the perl Mail::SPF::Query module) has a
mode of operation where mail from hosts that are listed as MXes for a
recipient's domain is allowed through (on the basis that SPF checking will
have been done on that MX).
The other implementations will no doubt have similar functionality because
obviously it's a big problem otherwise.
Paul.