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Re: [ietf-smtp] SPF DNS query limits

2016-05-25 07:05:36
'include:%{i4r}'. T
Yuck.  That feels really fragile.

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.

John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
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