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-rw-r--r--core/conf/exim/exim.conf4
1 files changed, 3 insertions, 1 deletions
diff --git a/core/conf/exim/exim.conf b/core/conf/exim/exim.conf
index 47a6094..074c8af 100644
--- a/core/conf/exim/exim.conf
+++ b/core/conf/exim/exim.conf
@@ -539,7 +539,9 @@ acl_check_data:
   # Deny if the message contains an overlong line.  Per the standards
   # we should never receive one such via SMTP.
   #
-  deny    condition  = ${if > {$max_received_linelength}{998}}
+  deny    message    = maximum allowed line length is 998 octets, \
+                       got $max_received_linelength
+          condition  = ${if > {$max_received_linelength}{998}}
 
   # Deny if the message contains a virus. Before enabling this check, you
   # must install a virus scanner and set the av_scanner option above.