> The question: Why PERCENT should be a sign for spam that recieve 50%
> of  the  hold  action  in  your  default  config file? Have I missed
> something?

It  would be very rare that a sender HAS to use source-routing such as
the  %  method,  so  the  assumption is that anyone doing so is either
deliberately  trying  to  relay  mail  through  your server or using a
broken client that defaults to this kind of outdated notation (another
sign  of  the  poor  programming  that seems, luckily for us, to often
coincide with spamming).

However,   there   is   nothing   *definitively*  malicious  or  fully
RFC-illegal  about  using  the  %,  so  someone  MIGHT  have an opt-in
database  or  strange server configuration that spits out this kind of
address. In 99.999% of cases in which it is used without malice, it is
still  probably  unnecessary,  but  I'm  sure you know the problems of
trying to get clients' clients to change their systems.

I don't use the PERCENT test at all, for the record.

-Sandy

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