[nikitis@email_server dovecot]$ sudo dovecot -n
# 2.2.10: /etc/dovecot/dovecot.conf
# OS: Linux 3.10.0-514.26.2.el7.x86_64 x86_64 CentOS Linux release 7.3.1611 (Core)
auth_mechanisms = plain login
first_valid_uid = 1000
mail_access_groups = mail
mail_location = mbox:~/mail:INBOX=/var/mail/%u
mbox_write_locks = fcntl
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix =
}
passdb {
  args = username_format=%n
  driver = passwd
}
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0666
    user = postfix
  }
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
}
ssl = required
ssl_cert = </etc/postfix/mail_secure.crt
ssl_key = </etc/postfix/mail_secure.key
ssl_key_password = <redacted>
userdb {
  args = username_format=%n
  driver = passwd
}
protocol lmtp {
  mail_plugins =
  postmaster_address = userA@wetnet.in
}
[userA@email_server dovecot]$ sudo doveadm user -u userA@wetnet.in
doveadm(root): Error: userdb lookup(userA@wetnet.in): Disconnected unexpectedly
doveadm(root): Error: userdb lookup failed for userA@wetnet.in