Implement mail server

terraform/k8sapps/resources/mail/dovecot.conf

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+dovecot_config_version = "2.4.0"
+dovecot_storage_version = "2.4.0"
+
+base_dir = /run/dovecot
+state_dir = /run/dovecot
+
+protocols = imap lmtp 
+listen = *
+
+mail_driver=maildir
+mailbox_list_layout=index
+mailbox_list_utf8=yes
+mail_path=~/mail
+mail_home=/var/mail/%{user|lower}
+mail_utf8_extensions = yes
+
+default_internal_user = vmail
+default_login_user = vmail
+default_internal_group = vmail
+
+mail_uid = vmail
+mail_gid = vmail
+
+namespace inbox {
+  inbox = yes
+
+  mailbox Drafts {
+    special_use = \Drafts
+    auto = create
+    auto = subscribe
+  }
+
+  mailbox Spam {
+    special_use = \Spam
+    auto = create
+    auto = subscribe
+  }
+
+  mailbox Trash {
+    special_use = \Trash
+    auto = create
+    auto = subscribe
+  }
+
+  mailbox Sent {
+    special_use = \Sent
+    auto = create
+    auto = subscribe
+  }
+
+  mailbox Archive {
+    special_use = \Archive
+    auto = create
+    auto = subscribe
+  }
+  
+  mailbox Important {
+    special_use = \Important
+    comment = All my important messages
+    auto = create
+    auto = subscribe
+  }
+}
+
+passdb passwd-file {
+  driver = passwd-file
+  passwd_file_path  = /etc/dovecot/users
+}
+
+ssl_server {
+  cert_file = /etc/letsencrypt/tls.crt
+  key_file = /etc/letsencrypt/tls.key
+}
+
+mail_attribute {
+  dict file {
+    path = %{home}/dovecot-attributes
+  }
+}
+
+log_path = /dev/stdout
+
+imap_hibernate_timeout = 5s
+
+mail_plugins {
+  fts = yes
+  fts_flatcurve = yes
+  mail_log = yes
+  notify = yes
+}
+
+mail_log_events = delete undelete expunge save copy mailbox_create mailbox_delete mailbox_rename flag_change
+
+fts_autoindex = yes
+fts_autoindex_max_recent_msgs = 999
+fts_search_add_missing = yes
+language_filters = normalizer-icu snowball stopwords
+
+language_tokenizers = generic email-address
+language_tokenizer_generic_algorithm = simple
+
+language en {
+  default = yes
+  filters = lowercase snowball english-possessive stopwords
+}
+
+fts flatcurve {
+  substring_search = yes
+}
+
+protocol imap {
+  mail_plugins {
+     imap_sieve = yes
+     imap_filter_sieve = yes
+  }
+}
+
+lmtp_save_to_detail_mailbox = yes
+recipient_delimiter = +
+
+protocol lmtp {
+   mail_plugins {
+      sieve = yes
+   }
+}
+
+service imap-login {
+  process_min_avail = 1
+  client_limit = 100
+  inet_listener imap {
+    port = 31143
+  }
+  inet_listener imaps {
+    port = 31993
+    ssl = yes
+  }
+}
+
+service stats {
+  process_min_avail = 1
+  inet_listener http {
+    port = 9090
+  }
+}
+
+service auth {
+  inet_listener auth {
+    port = 31000
+  }
+}
+
+# LMTP service to store sent emails
+service lmtp {
+  inet_listener auth {
+    port = 31024
+  }
+  mail_plugins {
+    sieve = yes
+  }
+}
+
+event_exporter log {
+   format = json
+   time_format = rfc3339
+}
+
+metric auth_success {
+  filter = (event=auth_request_finished AND success=yes)
+}
+
+metric auth_failure {
+  filter = (event=auth_request_finished AND NOT success=yes)
+  exporter = log
+}
+
+metric imap_command {
+  filter = event=imap_command_finished
+  group_by cmd_name {
+    method discrete {
+    }
+  }
+  group_by tagged_reply_state {
+    method discrete {
+    }
+  }
+}
+
+metric smtp_command {
+  filter = event=smtp_server_command_finished and protocol=submission
+  group_by cmd_name {
+     method discrete {
+    }
+  }
+  group_by status_code {
+     method discrete {
+    }
+  }
+  group_by duration {
+     method exponential {
+       base = 10
+       min_magnitude = 1
+       max_magnitude = 5
+    }
+  }
+}
+
+metric lmtp_command {
+  filter = event=smtp_server_command_finished and protocol=lmtp
+  group_by cmd_name {
+     method discrete {
+    }
+  }
+  group_by status_code {
+     method discrete {
+    }
+  }
+  group_by duration {
+     method exponential {
+       base = 10
+       min_magnitude = 1
+       max_magnitude = 5
+    }
+  }
+}
+
+metric mail_delivery {
+  filter = event=mail_delivery_finished
+  group_by duration {
+     method exponential {
+       base = 10
+       min_magnitude = 1
+       max_magnitude = 5
+     }
+  }
+}
+
+sieve_script default {
+  path = /etc/dovecot/sieve/default.sieve
+}