This article provides a quick overview of the DNS records required for an email server and presents a minimal sample configuration. The example assumes that you are running servers for both email and the web. Comments indicating the changes if you are using a third-party provider are provided.
How to provide DNS server addresses to IPv6 clients using Router Announcements.
SPF (Server Policy Framework) is a simple means to limit the ability of others to forge your identity in email. I first implemented it after a forged identity under my domain was used to send Spam. Once SPF was configured, the bounce messages quickly dropped off. Although not as frequently implemented as sender address checks, SPF… Continue reading Securing your Email Reputation with SPF
Replacing 6to4 tunnel with 6in4. IPv6 enabling Bind, Exim, SPF, Squid, and updating Databases containing IP addresses.
Squid is a proxy service for HTTP and other requests. This article covers installing it and configuring it to run on Ubuntu as a transparent proxy. This documentation includes configuring Web Proxy Auto-Discovery (WPAD) via DHCP and DNS. I run a heterogeneous configuration. This provided a number of challenges as various implementations of WPAD were encountered. Each seems to… Continue reading Setting up Squid Proxy on Ubuntu
I administer an email server for a couple of domains and a few users. Incorrectly configured email servers result in a lot of my administration work. Due to improper configuration, far too many servers look like Spam servers. A little effort in setting up your server can make my life easier, and increase your chance… Continue reading Running an Email Server
Now I have replaced my old firewall with OpenWRT, I needed to enhance the configuration of dnsmasq to support the network. The old Ubunutu based firewall was already running dnsmasq, as does the DNS server on the LAN. I run a mixed network with wired and wireless clients on separate address ranges. DHCP services are… Continue reading OpenWRT and Ubuntu dnmasq setup