I have a droplet running 14.04 and my domain is registered through NameCheap. I’ve followed the tutorial for setting up Postfix but I cannot receive emails sent to my domain. I have no idea how to set up email records or which email records to use on NameCheap and I need help.
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Postfix is generally used as an MTA allowing the sending of emails over SMTP but in most cases other pieces are used with it to provide a complete email system with user and box management, etc.
Running a mail server can be a time consuming and complicated undertaking which is why we often recommend against doing this if you are not an experienced sysadmin. There are alternatives like zoho which I use personally for my small projects that provides free mail hosting for your domain and up to (i think) 10 users.
If you do want to configure and run a mail server for your own use I would recommend starting with this tutorial which sets up mail-in-a-box, a complete mail server solution built from open source components.