I rebooted the server. And everything seems working perfectly now.
Just for info, the output of "dovecot -n":
Code
- # 2.2.9: /etc/dovecot/dovecot.conf
- # OS: Linux 3.13.0-40-generic x86_64 Ubuntu 14.04.1 LTS
- auth_mechanisms = plain login cram-md5 digest-md5
- disable_plaintext_auth = no
- mail_location = maildir:~/
- mail_plugins = quota
- namespace inbox {
- inbox = yes
- location =
- prefix = INBOX.
- separator = .
- type = private
- }
- passdb {
- args = /etc/dovecot/dovecot-sql.conf
- driver = sql
- }
- plugin {
- quota = maildir:User quota
- quota_rule = *:storage=1GB
- quota_warning = storage=95%% quota-warning 95 %u
- quota_warning2 = storage=80%% quota-warning 80 %u
- }
- protocols = " imap pop3"
- service auth {
- unix_listener auth-master {
- mode = 0600
- user = vmail
- }
- }
- service quota-warning {
- executable = script /var/www/imscp/engine/quota/imscp-dovecot-quota.sh
- group = imscp
- unix_listener quota-warning {
- mode = 0600
- user = vmail
- }
- }
- ssl_cert = </etc/imscp/imscp_services.pem
- ssl_key = </etc/imscp/imscp_services.pem
- ssl_protocols = !SSLv2 !SSLv3
- userdb {
- driver = prefetch
- }
- userdb {
- args = /etc/dovecot/dovecot-sql.conf
- driver = sql
- }
- protocol imap {
- mail_plugins = quota imap_quota
- }
- protocol pop3 {
- pop3_uidl_format = %u-%v
- }
- protocol lda {
- auth_socket_path = /var/run/dovecot/auth-master
- mail_plugins = quota
- postmaster_address = postmaster@xxx
- }
Thanks.