dovecot.conf

# 2.3.1 (8e2f634): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.1 (d9bc6dfe)
# OS: Linux 4.9.0-6-amd64 x86_64 Debian 9.4 
# Hostname: mail.iwascoding.com
auth_cache_size = 10 M
auth_cache_ttl = 2 hours
auth_mechanisms = plain login
first_valid_gid = 8
first_valid_uid = 8
hostname = iwascoding.com
imap_capability = +SPECIAL-USE
last_valid_gid = 8
last_valid_uid = 8
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
mail_debug = yes
mail_gid = 8
mail_home = /var/mail/iwascoding/%n
mail_location = mdbox:~/mdbox
mail_plugins = quota listescape
mail_prefetch_count = 200
mail_uid = 8
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 index ihave duplicate mime foreverypart extracttext spamtest spamtestplus
mdbox_rotate_size = 16 M
namespace inbox {
  inbox = yes
  location = 
  mailbox "Sent Messages" {
    auto = no
    special_use = \Sent
  }
  mailbox archive {
    auto = no
    special_use = \Archive
  }
  mailbox drafts {
    auto = no
    special_use = \Drafts
  }
  mailbox junk {
    auto = no
    special_use = \Junk
  }
  mailbox sent {
    auto = no
    special_use = \Sent
  }
  mailbox trash {
    auto = no
    special_use = \Trash
  }
  prefix = 
  separator = /
}
passdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  quota = dict:User quota::file:%h/dovecot-quota
  quota_grace = 10%%
  quota_rule = *:storage=200M
  sieve = /var/mail/iwascoding/%n/.dovecot.sieve
  sieve_default = /var/lib/dovecot/sieve/default.sieve
  sieve_dir = /var/mail/iwascoding/%n/sieve
  sieve_extensions = +spamtest +spamtestplus
  sieve_global_dir = /var/lib/dovecot/sieve/global
  sieve_spamtest_max_value = 200
  sieve_spamtest_status_header = X-Spam-Score-Int
  sieve_spamtest_status_type = score
}
postmaster_address = postmaster@iwascoding.com
protocols = imap pop3 lmtp imap lmtp sieve pop3 submission
quota_full_tempfail = yes
service auth {
  unix_listener auth-userdb {
    user = mail
  }
}
service lmtp {
  user = mail
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
}
service stats {
  unix_listener stats-writer {
    user = mail
  }
}
service submission-login {
  inet_listener submission {
    port = 5870
  }
}
ssl = required
ssl_cert = </etc/nginx/certs/iwascoding.crt
ssl_cipher_list = ALL:HIGH:!SSLv2:!SSLv3:!MEDIUM:!LOW:!EXP:!RC4:!MD5:!aNULL:@STRENGTH
ssl_client_ca_dir = /etc/ssl/certs
ssl_dh =  # hidden, use -P to show it
ssl_key =  # hidden, use -P to show it
ssl_min_protocol = TLSv1.2
ssl_prefer_server_ciphers = yes
submission_relay_host = mail.iwascoding.com
submission_relay_port = 587
submission_relay_ssl = starttls
userdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
protocol lmtp {
  mail_fsync = optimized
  mail_plugins = quota listescape sieve
}
protocol lda {
  mail_fsync = optimized
  mail_plugins = quota listescape sieve
}
protocol imap {
  mail_max_userip_connections = 40
  mail_plugins = quota listescape imap_quota imap_zlib
}
protocol pop3 {
  mail_max_userip_connections = 30
}