--- src/compose.c 
+++ src/compose.c 
@@ -4108,6 +4108,7 @@
 	}
 
 	/* Program version and system info */
+	/*useragent disable begin
 	if (compose->to_list && !IS_IN_CUSTOM_HEADER("X-Mailer")) {
 		fprintf(fp, "X-Mailer: %s (GTK+ %d.%d.%d; %s)\n",
 			prog_version,
@@ -4120,7 +4121,7 @@
 			gtk_major_version, gtk_minor_version, gtk_micro_version,
 			TARGET_ALIAS);
 	}
-
+	useragent disable end */
 	/* custom headers */
 	if (compose->account->add_customhdr) {
 		GSList *cur;