Hi again, I have a working test environment not but I don't feel very comfortable with a non encrypted connection between the proxy/director and the backend servers. If I set ssl = required on my backend server I get this error: imap-login: Disconnected (tried to use disabled plaintext auth) Is there a chance to encrypt this connection? # 2.0.16: /usr/local/etc/dovecot/dovecot.conf # OS: Linux 2.6.32-5-amd64 x86_64 Debian 6.0.3 auth_debug = yes auth_verbose = yes director_mail_servers = 172.17.0.31 director_servers = 172.17.213.213 disable_plaintext_auth = no lmtp_proxy = yes mail_debug = yes passdb { args = proxy=y nopassword=y driver = static } service auth { unix_listener auth-userdb { mode = 0600 user = dovecot } } service director { fifo_listener login/proxy-notify { mode = 0666 } inet_listener { port = 5515 } unix_listener director-userdb { mode = 0600 } unix_listener login/director { mode = 0666 } } service imap-login { executable = imap-login director } ssl = required ssl_cert = </etc/ssl/certs/***.crt ssl_key = </etc/ssl/certs/***.key and the backend # 2.0.16: /usr/local/etc/dovecot/dovecot.conf # OS: Linux 2.6.32-5-amd64 x86_64 Debian 6.0.3 disable_plaintext_auth = no listen = 172.17.0.31 mail_gid = vmail mail_home = /var/mail/%d/%n mail_location = mdbox:~/mdbox mail_plugins = quota mail_uid = vmail managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave namespace { inbox = yes location = prefix = INBOX. separator = . type = private } passdb { args = /usr/local/etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { autocreate = INBOX.Sent autocreate2 = INBOX.Trash autocreate3 = INBOX.Drafts autocreate4 = INBOX.Spamverdacht autosubscribe = INBOX.Sent autosubscribe2 = INBOX.Trash autosubscribe3 = INBOX.Drafts autosubscribe4 = INBOX.Spamverdacht quota = dict:User quota::file:%h/mdbox/dovecot-quota quota_rule2 = INBOX.Trash:storage=+100M quota_warning = storage=90%% quota-warning 90 %u quota_warning2 = storage=75%% quota-warning 75 %u sieve = ~/.dovecot.sieve sieve_dir = ~/sieve sieve_global_path = /usr/local/etc/dovecot/sieve/default.sieve } protocols = imap sieve service imap-login { service_count = 1 } service managesieve-login { inet_listener sieve { port = 4190 } inet_listener sieve_deprecated { port = 2000 } service_count = 1 } ssl = required ssl_cert = </etc/ssl/certs/imap.wk-serv.de.crt ssl_key = </etc/ssl/certs/imap.wk-serv.de.key userdb { args = /usr/local/etc/dovecot/dovecot-sql.conf.ext driver = sql } protocol imap { mail_plugins = quota imap_quota autocreate }