How to set up a Mail Server that uses GMail as the backend, on Ubuntu/Apache with Multiple Domains on Virtual Hosts

I have multiple domains set up on multiple virtual hosts (Ubuntu 14 with Apache).

I want to create a simple email send and receive system that uses GMail accounts as POP3 mailboxes.

I don’t need WebMail, or Spam filtering or Virus filtering, etc., because GMail will do that. I don’t need IMAP.

Each domain needs a single email address, no more.

What’s is a simple recipe to achieve this? (Note that I have virtual hosts, and I would like each domain to get its own email address using that domain).

Step by step instructions will be most helpful!

keywords: postfix dovecot iredmail qmail mx record cname

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We have this setup working well with Ubuntu 16.04, with multiple domains / Gmail boxes, spam/antivirus filtering, dmarc setting (for our domains) and dmarc checking/blocking (for other domains). Also when an email is returned by Gmail as being unsuitable it isn’t sent again (even though Gmail may have given a transient error code) and the sender’s ip is banned for a period.