kAnswered
IMAP::kAnswered, nextFlags);
if ((flags & IMAP::kAnswered) != 0)
flags &= ~(IMAP::kAnswered | IMAP::kSeen);
flags |= IMAP::kAnswered | IMAP::kSeen;
if ((flags & IMAP::kAnswered) != 0)
flags |= IMAP::kAnswered;