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17     <LI>MTA - Filter Communication
23 third-party software to validate and modify messages as they pass
29 administrator to combine multiple independently-developed filters.
32 We expect to see both vendor-supplied, configurable mail filtering
33 applications and a multiplicity of script-like filters designed by and
37 This allows filters to exercise fine-grained control at the SMTP level.
41 <EM>The dialog is purposely lock-step, one-at-a-time</EM>)
57         to hang or core-dump
73               by defining thread-clean interfaces including local data hooks.
85 third-party filters to implement a desired mail filtering policy.  For
89 the MTA to filter messages first through a server based anti-virus
90 engine, then via a large-scale spam-catching service, and finally
103 <H2>MTA - Filter communication</H2>
122 <A HREF="#figure-1">Figure 1</A> illustrates a possible network of
127 <A name="figure-1"><IMG src="figure1.jpg" ALT=""></A><BR>
135 of library calls.  <A href="#figure-2">Figure 2</A> shows a single
143 <FONT size="-1">