Why is dovecot not letting users through?

Question

MySQL

When connecting to the server via telnet, I connect and see:

* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS AUTH=PLAIN AUTH=LOGIN] DraTooTi)0)!!.
LOGIN [email protected] test123
* BAD Error in IMAP command received by server.

Server config:

:~ # dovecot -n
# 2.2.28 (bed8434): /usr/local/etc/dovecot/dovecot.conf
# OS: FreeBSD 10.3-RELEASE-p11 amd64
auth_default_realm = dataharbour.tk
auth_mechanisms = plain login
auth_realms = dataharbour.tk
disable_plaintext_auth = no
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
login_greeting = DraTooTi)0)!!.
mail_gid = 1000
mail_location = maildir:/var/vmail/%d/%n
mail_plugins = quota
mail_uid = 1000
namespace inbox {
  inbox = yes
  location =
  prefix =
}
passdb {
  args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  autocreate = Trash
  autocreate2 = sent-mail
  autocreate3 = drafts
  autosubscribe = Trash
  autosubscribe2 = sent-mail
  autosubscribe3 = drafts
  quota = maildir:User quota
  quota_rule = *:storage=1G
  quota_rule2 = Trash:storage=+100M
  quota_warning = storage=95%% quota-warning 95 %u
  quota_warning2 = storage=80%% quota-warning 80 %u
}
protocols = imap pop3
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0666
    user = postfix
  }
  unix_listener auth-userdb {
    group = vmail
    mode = 0666
    user = vmail
  }
  user = vmail
}
service imap-login {
  inet_listener imap {
    port = 143
  }
  inet_listener imaps {
    port = 993
    ssl = yes
  }
}
service pop3-login {
  inet_listener pop3 {
    port = 110
  }
  inet_listener pop3s {
    port = 995
    ssl = yes
  }
}
service quota-warning {
  executable = script /usr/local/bin/quota-warning.sh
  unix_listener quota-warning {
    user = vmail
  }
  user = dovecot
}
ssl_cert = </etc/postfix/certs/cert.pem
ssl_key =  # hidden, use -P to show it
userdb {
  args = /usr/local/etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
protocol lda {
  mail_plugins = quota autocreate
}
protocol imap {
  mail_plugins = quota autocreate quota imap_quota
}

Answer 1

I solved the problem, there were no write permissions for the vmail user in the /var/vmail directory

Answer 2

it looks like login is allowed, try
A LOGIN [email protected] test123