diff --git a/src/lib-sieve/plugins/vacation/cmd-vacation.c b/src/lib-sieve/plugins/vacation/cmd-vacation.c
index 12daacd561a89068e23bb3dcdfab9b76024bf716..d1b1dc5daafea68847f01ce340a970258129f5c7 100644
--- a/src/lib-sieve/plugins/vacation/cmd-vacation.c
+++ b/src/lib-sieve/plugins/vacation/cmd-vacation.c
@@ -988,7 +988,8 @@ static bool act_vacation_commit
 	if ( *hdsp == NULL ) {
 		/* No, bail out */
 		sieve_result_log(aenv, 
-			"discarding vacation response for implicitly delivered message");	
+			"discarding vacation response for message implicitly delivered to <%s>",
+			( msgdata->to_address == NULL ? "UNKNOWN" : msgdata->to_address ) );	
 		return TRUE;				 
 	}