and to local connections

Signed-off-by: AGentooCat <agentoocat@mail.i2p>

src/smtp.c

@@ -366,6 +366,9 @@ int smtp_line(struct lineconn_t *hand) {
 	SETMSGON(NOOP, "220 OK...");
 
 	case AUTH:
+	    if (state->is_incoming)
+		goto smtplinefail;
+
 	    if (strcmp(com->argv[0], "PLAIN") != 0) {
 		msg = "501 Unknown auth type; only PLAIN is supported";
 	    } else if (state->from || state->auth_admin) {