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Hello there, Everything was working fine on Dovecot 2.2.10 (on CentOS 7), but after updating to version 2.2.36, our director servers are not able to proxy LMTP. We are sending mail from exim to the local Dovecot LMTP socket, which then used to send it to our internal mail servers on port 24. Besides the update, nothing has changed in the config files. The configuration has been working great

....36 (1f10bfa63): /etc/dovecot/dovecot.conf # Pigeonhole version 0.4.24 (124e06aa) doveconf: Warning: service auth { client_limit=5200 } is lower than required under max. load (6144) # OS: Linux 3.10.0-693.17.1.el7.centos.plus.x86_64 x86_64 CentOS Linux release 7.6.1810 (Core) ? # Hostname: imapdir1.randomdomain.net auth_master_user_separator = * auth_mechanisms = plain login cram-md5 default_client_limit = 5200 default_process_limit = 1024 director_mail_servers = 10.9.5.131 10.9.5.132 director_servers = 10.9.5.151 10.9.5.152 disable_plaintext_auth = no doveadm_port = 24245 first_valid_uid = 1000 lmtp_prox...