I like to have a working mail setup on all machines as this allows to be notified about cronjobs that failed and also to be able to send other notifications that would otherwise be lost. It is also especially useful for things like git send-email or automatically sending GPG signatures with caff to others.
However, mails cannot just be sent from any device and mail servers on the internet usually reject mails from dial-up IPs or public WiFi networks. To fight spam, techniques like SPF have been developed that restrict the mail servers that are allowed to send mails for the domain name used in the From: field. Therefore the best way is to relay all outgoing mail through the mail server that is responsible for your domains.
While most tools also allow you to configure an external SMTP server, it is on one hand tedious to configure it everywhere and on the other hand also insecure if you have to write the username and password for authentication to many user-readable configuration files on your system. Therefore I am running a local MTA on all the computers I administrate to relay mails to a central mail server.
For testing purposes, I have a VM in VirtualBox currently runnning macOS 10.12 Sierra. Now that macOS 10.13 High Sierra is in Beta, I wanted to upgrade my VM to this new release. However, this proved to be difficult with the usual ways. This blog post will describe how to upgrade a Sierra VM to High Sierra.
X-Chat Aqua is a very nice IRC client for Mac OS X, but the latest version for download on their website is way out of date and a few years old.
X-Chat Aqua screenshot
A while ago libc volunteered to import the old CVS into a new SVN repository and started development on it again. So the version in SVN is now based on xchat 2.8.x, but there are still no binaries available.
Therefore I just put together my own build and I am also offering it as a download for everyone. The application bundle contains an Universal binary for both PowerPC and x86, while I was only able to test them on Leopard.