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http://bugs.exim.org/show_bug.cgi?id=1062




--- Comment #5 from Andrey N. Oktyabrski <[email protected]>  2011-01-13 12:32:22 
---
(In reply to comment #3)
> Exim has a very powerful string expansion language, but it's not a general
> purpose scripting language, does not pretend to be and it's unwise to treat it
> as such.  There are plenty of hooks for using external tools, or an embedded
> Perl interpreter, etc.  The string manipulations with map/reduce and so on are
> conveniences which have proven incredibly powerful, but if you find yourself
> hitting the limits of those, then switch to an external scanner.  Exim is
> designed as an MTA which can talk to various content scanners, not to be a
> content scanner in its own right.
Some tasks are more complex than the <string_list> -> <string> translation, but
requires fast execution because works in the smtp session. Calling external
tool is a connect to the external tool and waiting for his answer. Sometimes it
is impossible. And I don't speak about content scanners. 


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