In <200312201439(_dot_)HBKEDY8W005286(_at_)asarian-host(_dot_)net> Mark
<admin(_at_)asarian-host(_dot_)net> writes:
1(_dot_)2(_dot_)3(_dot_)4(_dot_)philip(_at_)altavista(_dot_)com(_dot_)HELO@foo.bar.lookup.spf.gladstonefamily.net
Would actually be ideal for use within a sendmail rule. In a real sendmail
rule, it might take a similar shape:
R$-.$-.$-.$- $: $(host $4.$3.$2.$1.$f.HELO.$s._spf.domain.name. $:OK $)
I can't say that I've thought this through all the way, but this
appears to have some large holes in it that are open for possible
abuse and/or bugs. In particular, the HELO string can be almost
anything, including something that would screw up the parsing of this
domain.
Are you sure that this format will lead to unambiguous and valid DNS
lookups?
Cool idea though.
-wayne
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