pip3

I was looking into how to install Mailman 3 following the official guide

I need to do this:-

sudo pip3 install mailman


??????

Does this mean anything to anyone?

FreeBSD does not understand pip3 and there is no PKG available.
 
I suggest just using the port/package to install it: mail/mailman. Although it's slightly older, it's still a supported version. The "problem" with PIP (and similar applications) is that they tend to install things outside of the normal package registration procedures. So you won't be alerted by things like pkg-audit(8) and you can't keep track of the versions and dependencies with pkg(8).
 
I suggest just using the port/package to install it: mail/mailman. Although it's slightly older, it's still a supported version. The "problem" with PIP (and similar applications) is that they tend to install things outside of the normal package registration procedures. So you won't be alerted by things like pkg-audit(8) and you can't keep track of the versions and dependencies with pkg(8).

The FreeBSD supported Mailman is v2 which is almost ten years old, albeit some changes have been made. Mailman 3 is a major redesign/rewrite.
 
The FreeBSD supported Mailman is v2 which is almost ten years old
It doesn't really matter how old it is, what's important is that it's still a supported version.

You could reach out to the maintainer and ask him if he's working on getting Mailman 3 ported.
 
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