--- a/src/deliver/deliver.c	Tue Jul 08 16:00:53 2008 +0530
+++ b/src/deliver/deliver.c	Tue Jul 08 16:26:54 2008 +0530
@@ -691,6 +691,7 @@
 	const char *mail_env, *const *envs, *home;
 	unsigned int i, count;
 	string_t *str;
+	char *env, *p;
 
 	home = getenv("HOME");
 
@@ -700,7 +701,19 @@
 	for (i = 0; i < count; i++) {
 		str_truncate(str, 0);
 		var_expand(str, envs[i], table);
-		env_put(str_c(str));
+
+		env = str_c_modifiable(str);
+		p = strchr(env, '=');
+		if (p != NULL) {
+			*p = '\0';
+			/* more or less temporary solution to allow lda section
+			   to override plugin settings. after config rewrite
+			   this should go away. */
+			if (getenv(env) == NULL) {
+				*p = '=';
+				env_put(env);
+			}
+		}
 	}
 
 	mail_env = getenv("MAIL_LOCATION");