I have now recorded 72 different senders to my spftest email address and
my regular email address. Most entries can be handled with 'mx'. Some of
the rest is spam (I suspect joe-jobbed in some cases!), but there is a
set which needs a ptr: mechanism which is the parent of the original
domain. For example:
dumbo.pobox.com needs a ptr:pobox.com
This leads me to the following:
* Extend the macro syntax that I described earlier to *all* mechanism
arguments. Unify it with the exp macro syntax for uniformity.
* Add a number of macro qualifiers -- the digits 1 to 9. This is to be
interpreted as the number of components to substitute.
Then the rule for dumbo.pobox.com could be ptr:%{d2}
While you could argue that this is no simpler than ptr:pobox.com, I
think it is conceptually cleaner.
Philip
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