Docs: update description of Sieve filter facilities

diff --git a/doc/doc-docbook/filter.xfpt b/doc/doc-docbook/filter.xfpt
index 740b7470a182debd3ec75e3a69a479b0a31acef3..3129e605638455e083f9acba9316e8aa6c0cc317 100644 (file)
--- a/doc/doc-docbook/filter.xfpt
+++ b/doc/doc-docbook/filter.xfpt
@@ -285,9 +285,11 @@ in RFC 3028, which should be read in conjunction with these notes.
 The Exim Sieve implementation offers the core as defined by RFC 3028,
 comparison tests, the subaddress parameter, the &*copy*&, &*envelope*&,
 &*fileinto*&, &*notify*&, and &*vacation*& extensions, but not the &*reject*&
-extension. Exim does not support message delivery notifications (MDNs), so
-adding it just to the Sieve filter (as required for &*reject*&) makes little
-sense.
+extension.
+.new
+Exim did not support message delivery notifications (MDNs) when Sieve handling
+was introduced, so &*reject*& (which need them) could not be supported.
+.wen
 
 In order for Sieve to work properly in Exim, the system administrator needs to
 make some adjustments to the Exim configuration. These are described in the