Changing Password Schemes

[Carl A Jeptha]

Good Day,
I have been following this tutorial without much luck - 
http://wiki2.dovecot.org/HowTo/ConvertPasswordSchemes#CA-26af2b83a43b8100522c57565773f605c21f2f27_1

It is obvious to me that I am not following the instructions correctly 
and need to be shown what I am misunderstanding.

I have an old postfix + dovecot + Roundcube mailserver 
(mail.domain.Tld). Server clock is loosing time and adjusting it causes 
dovecot to kill itself, we cannot install more memory, bigger 
hard-drives, etc.

I have built a new server box (mail2.domain.Tld) With Postfix + dovecot 
+ Roundcube. This server is functioning, with a client's new domain, and 
my personal domain. it's password system is SHA512-CRYPT.

I have imported the users from the old server over to the new server. I 
have created a new column "plain_pass" for the plain passwords.

I will be using imapsync to transfer the mail folders from the one 
server to the other, but will not proceed until I fix this issue.

# 2.2.18: /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.8 (0c4ae064f307+)
# OS: Linux 4.2.0-35-generic x86_64 Ubuntu 15.10 ext4
auth_mechanisms = plain login
first_valid_gid = 8
first_valid_uid = 150
last_valid_gid = 8
last_valid_uid = 150
listen = *
mail_gid = mail
mail_location = maildir:/var/vmail/%d/%n
mail_uid = vmail
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 = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
plugin {
   quota_grace = 10%%
   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
}
postmaster_address = postmaster at airnet.ca
protocols = imap pop3 lmtp lmtp pop3
service auth {
   unix_listener /var/spool/postfix/private/auth {
     group = postfix
     mode = 0666
     user = postfix
   }
   unix_listener auth-userdb {
     group = mail
     mode = 0666
     user = vmail
   }
}
service imap-login {
   inet_listener imap {
     port = 143
   }
   inet_listener imaps {
     port = 993
     ssl = yes
   }
}
service imap-postlogin {
   executable = script-login /usr/local/etc/popafter.sh
   user = $default_internal_user
}
service imap {
   executable = imap imap-postlogin
}
service pop3-login {
   inet_listener pop3 {
     port = 110
   }
   inet_listener pop3s {
     port = 995
     ssl = yes
   }
}
service pop3-postlogin {
   executable = script-login /usr/local/etc/popafter.sh
   user = $default_internal_user
}
service pop3 {
   executable = pop3 pop3-postlogin
}
ssl_cert = </etc/ssl/certs/ssl-cert-snakeoil.pem
ssl_cipher_list = 
ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA
ssl_dh_parameters_length = 2048
ssl_key = </etc/ssl/private/ssl-cert-snakeoil.key
ssl_prefer_server_ciphers = yes
ssl_protocols = !SSLv2 !SSLv3
userdb {
   driver = prefetch
}
userdb {
   args = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}

-- ------------ You have a good day now, en mag jou môre ook so wees, 
Carl A Jeptha