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diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
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--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -1,4 +1,4 @@
-$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.89 2005/03/15 11:37:21 ph10 Exp $
+$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.90 2005/03/15 12:27:54 ph10 Exp $
Change log file for Exim from version 4.21
-------------------------------------------
@@ -31,6 +31,15 @@ PH/03. A redirect router that has both "unseen" and "one_time" set does not
again. For this reason, Exim now forbids the simultaneous setting of
these two options.
+PH/04. Change 4.11/85 fixed an obscure bug concerned with addresses that are
+ redirected to themselves ("homonym" addresses). Read the long ChangeLog
+ entry if you want to know the details. The fix, however, neglected to
+ consider the case when local delivery batching is involved. The test for
+ "previously delivered" was not happening when checking to see if an
+ address could be batched with a previous (undelivered) one; under
+ certain circumstances this could lead to multiple deliveries to the same
+ address. A one-line patch to add the appropriate test fixes the bug.
+
A note about Exim versions 4.44 and 4.50
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