fixing an odd exchange behaviour

src/defs.h

@@ -199,6 +199,7 @@ struct session_data {
    char digest[2*DIGEST_LENGTH+1];
    time_t now, sent, delivered, retained;
    char ms_journal;
+   char import;
    int journal_envelope_length, journal_bottom_length;
 #ifdef NEED_MYSQL
    MYSQL mysql;