Step by step on how to set up Policyd-SPF with Postfix and Amavisd-new for DKIM signing on CentOS 8/RHEL 8 mail server to improve email deliverability.
SPF and DKIM are two types of TXT records in DNS that can help with preventing email spoofing and making legitimate emails delivered into the recipient’s inbox instead of spam folder. If your domain is abused by email spoofing, then your emails are likely to landed in recipient’s spam folder if the recipient didn’t add you in address book.
SPF (Sender Policy Framework) record specifies which hosts or IP addresses are allowed to send emails on behalf of a domain. You should allow only your own email server or your ISP’s server to send emails for your domain.
DKIM (DomainKeys Identified Mail) uses a private key to add a signature to emails sent from your domain. Receiving SMTP servers verify the signature by using the corresponding public key, which is published in your domain’s DNS records.
Run Your Own Email Server on CentOS 8/RHEL 8 - Postfix SMTP Server - This is the best tutorial series about building email server on CentOS 8/RHEL 8 from scratch on the Internet. Not only will you have a working email server, but also you will have a much better understanding about how email works.
Set Up Samba Server on CentOS 8/RHEL 8 for File Sharing - In this tutorial, we’re going to learn how to install and configure a samba server on CentOS 8/RHEL8 to share files on the local network. Samba is a free and open-source SMB/CIFS protocol implementation
Set Up CUPS Print Server on CentOS 8/RHEL 8 - This tutorial will be showing you how to share a CUPS printer attached to a CentOS 8/RHEL 8 computer with Windows, macOS, and iOS clients on the same network.
This tutorial is going to show you how to create virtual mailboxes on CentOS 8/RHEL 8 mail server with PostfixAdmin, which is an open-source web-based interface to configure and manage a Postfix based email server for many domains and users.
Roundcube is a free and open source webmail client. This tutorial shows you how to install Roundcube webmail on CentOS 8/RHEL 8 with Apache or Nginx web server.