Email Manager, Email configuration using VPS server Work Needed

I have a freshly-provisioned VPS that needs to handle all of my domain’s email. The core job is to turn this blank server into a fully functioning mail system that can send and receive reliably while passing modern deliverability checks.

Here’s what I need done:

• Install and configure the mail transfer and delivery stack on the VPS (Postfix/Dovecot or an equivalent, as long as it is stable and well-documented).
• Enable secure access over SMTP, IMAP and POP3 with valid TLS certificates.
• Create the first mailboxes and aliases, confirm they work from common clients such as Outlook, Gmail (via external POP/IMAP), and Thunderbird.
• Set up DNS records—SPF, DKIM, DMARC and the appropriate A/MX entries—so that test messages land in inboxes, not spam.
• Provide a simple webmail interface or clear instructions for connecting via desktop/mobile clients.
• Hand over concise documentation showing every command/configuration file you touched, so future maintenance is straightforward.

Acceptance criteria
1. A test message sent from the new server reaches Gmail without warnings and passes SPF, DKIM and DMARC checks.
2. Round-trip retrieval over IMAP and POP3 works using SSL on standard ports.
3. No open-relay or security vulnerabilities are reported by basic online scanners.

If you stick to widely supported packages and best practices, the job should be smooth; I just want everything verified before sign-off.