<div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I'm trying to follow this guide: <a href="https://help.ubuntu.com/community/Mailman" target="_blank">https://help.ubuntu.com/community/Mailman</a> It calls the postfix-to-mailman.py script when a mail is delivered to a list. Associate the domain <a href="http://lists.example.com" target="_blank">lists.example.com</a> to the mailman transport with the transport map. Edit the file /etc/postfix/transport: <a href="http://lists.example.com" target="_blank">lists.example.com</a> mailman: and am curious as to whether it's a problems that /etc/postfix/transport doesn't yet exist. Should that file get created by a previous step, or it makes sense to create this file? I ask because the wording indicates to edit an existing file, and I question how significant that is. </blockquote><div> If the file does not exist, create it. Since this is first time you are using postfix on this server, it is likely that the file does not already exist since you have not created any transport maps yet. Regards, Rigved </div></div>