The account you are trying to login as has triggered a security warning.
The account in the database is assosiated with the mail-server $var['origserver'] , while you are trying to access the remote account with the mail-server $var['server']
Access is locked since the assosiated mail-server address is no longer used
This is used as a security precaution to disallow access from unauthorized hostnames
To resolve the access error
Login to the new remote-mailserver with the existing password used in $pref['brandname']
Contact the administrator $this->admin_email to assosciate your account with the new mail-server address