I realized that %{s1(_at_)} gives the domain of the current-sender (as
opposed to the current-domain). The bad news is that you can't then just
take the last two (or whatever) components for use in an MX or PTR.
I still think that adding a macro character to get the domain of the
current-sender would fill out the set of macro characters. Without it,
many sites that need to use multiple records (includes or redirects)
will have problems and maybe suprises.
It may be that we need to add some implementation notes to a document
somewhere. These could include:
* Remember that an unqualified A, PTR, MX refers to the domain name of
the SPF record, *not* the domain of the sender
* Remember that other domains may 'include' your SPF record (especially
if you are an ISP and the includer is a vanity domain)
Philip
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