configure and implement email and Wordpress based website/portal

Systems for my business 1. Email We require licensed open source products to get the email going. BTR has purchased a droplet (VPS) hosted at Digital Ocean for this purpose. BTR’s domain is registered with Go Daddy. We will use the following technology stack on CentOS linux server to have an enterprise system configured. Apache httpd 2.4.39 Postfix 3.4.6 Dovecot Release V2.3.7.1 Postfixadmin 3.2 or higher PostgreSQL (pgsql) ver 11.4 Imap implementation will be required and extra drive space 500GB will be purchased from …. The email datastore will be seamlessly extended to 500GB data storage. Email will be secured with SSL certificates from "Let's Encrypt" Postfix will be database driven and PostgreSQL will be used to achieve this objective i.e. package postfix-postgresql Postfix will be set and configured with PostfixAdmin, which is a web based interface to configure and manage Postfix based email server. Restrict Postfix from being used as an open relay. Make it hacking proof. The desktop email client can be Outlook, Thunderbird, Apple’s email client etc. I also want to configure mobile devices to send and receive emails. IOS and android based devices will be used for a full email experience. The email repository should be available across all devices. All emails will be replicated in real time. A replication arrangement has to be provided. User creation etc. would be thru postfixadmin. Root access will be given to the implementor. Implementor will be bound by non-disclosure to keep all activities under this project confidential and not to disclose for two years. 2. Website A Wordpress based website/portal will be created. It will have all standard features of web 3.0 and web 4.0 implemented. The environment and tools given for email above will be also used for the wordpress system implementation