Mail Setup at OSX Server issues

Question

I have several devices (iPad, iPhone, Desktop and Laptop) that access my email accounts (Personal-POP and Business-IMAP accounts) without any issues.
I'd like to use my Mac Mini OSX Server as a main client to all these emails account and collect emails and distribute it at my local network.
Is it possible? I'd like to use all resources from my ISP that can handle with virus, security ... but at the same time I'd like to keep local at this OSX Server all messages that we usually send and receive when we are using local network at office. I read manual several times but is not clear for me if this feature is available.
All suggestions will be welcome.
Edison

Answer 1

OS X Server and most mail servers do not include the ability to collect mail from remote servers, though it is possible to build a somewhat precarious scheme  based on forwarding messages from the remote servers involved. Google's mail service and its gmail client do have the ability to retrieve mail from other remote mail servers without resorting to forwarding mail around, but you'd need to integrate something like imapsync or fetchmail to perform this on OS X Server.  (Related — my old replies to related questions here in the forums will often mention imapsync, as well.)
In general when running a mail server that's accessible to the Internet, you'll need DNS and also static (fixed) IP from your provider for OS X Server and this is the preferred and most reliable means, this if if you want to send outbound mail through the server, or you'll need to relay your inbound and outbound mail through one of the relay services providers.  Static IP and proper DNS can also be a factor when receiving mail from some of the more cautious mail servers around.  Failing to have IP and DNS correct mails mail sent from your server can be dropped, and sometimes mail sent to your server will be dropped before being passed to your server.
OS X Server does include some spam- and malware-related capabilities and various Postfix, Amavis, ClamAV and related pieces to keep a lid on most typical spam shenanigans, though you might want additional services or the replacement of the OS X Server mail server with the mail package from Kerio.