* lmtp/lda: dovecot.index.cache file is no longer fully mapped to memory, allowing mail deliveries to work even if the file is huge. * auth: userdb passwd lookups are now done by auth worker processes instead of auth master process (as it was documented, but accidentally didn't work that way). + lmtp: lmtp_rcpt_check_quota=yes setting checks quota on RCPT TO. - lmtp: After successful proxying RCPT TO, the next one to a nonexistent user gave tempfail error instead of "user not found". - lmtp proxy: Fixed hanging if remote server was down. - imap: Fixed crash when SEARCH contained multiple KEYWORD parameters. - doveadm: Various fixes to handling doveadm-server connections. - -i <instance name> parameter for Dovecot tools didn't work correctly. - director was somewhat broken in v2.1.10. This version also includes various reliability enhancements. - auth: passdb imap was broken in v2.1.10.