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...lient gets the following error from the proxy: -ERR [IN-USE] Account is temporarily unavailable. System-details: OS: Debian Linux Proxy: 2.0.5-0~auto+23 Backend: 2.0.13-0~auto+54 Have you any idea what could cause this type of error? Thanks and regards Urban Loesch doveconf -n from one of our backendservers: # 2.0.13 (02d97fb66047): /etc/dovecot/dovecot.conf # OS: Linux 2.6.38.8-vs2.3.0.37-rc17-rol-em64t-timerp x86_64 Debian 6.0.2 ext4 auth_cache_negative_ttl = 0 auth_cache_size = 40 M auth_cache_ttl = 12 hours auth_mechanisms = plain login auth_username_format = %Lu auth_verbose = yes deliver_log_fo...