snprintf (seq_unseen, sizeof (seq_unseen), "%s:", NONULL (MhUnseen));
snprintf (seq_replied, sizeof (seq_replied), "%s:", NONULL (MhReplied));
snprintf (seq_unseen, sizeof (seq_unseen), "%s:", NONULL (MhUnseen));
snprintf (seq_replied, sizeof (seq_replied), "%s:", NONULL (MhReplied));