'include:%{i4r}.spf.ebay.com'. T
Yuck. That feels really fragile.
Why?
Is it just that SPF macros aren't well implemented (despite them being a key
part of SPF), or something else?
Partly it's poor SPF implementations, partly that it's a much more complex
set of records to publish. Your example as written requires a record for
every outbound IPv4 mail server, and probably still puts all of the IPv6
servers into one record or for a really large provider one record per RIR
from whom they get space. Neither strike me as something that's likely to
be maintained reliably.
Regards,
John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
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