Although Apple published a helpful list of TCP and UDP port numbers used by it’s products, it’s a little unclear as to which ones Workgroup Manager needs.

You can figure it out yourself by enabling firewall logging on your Mac OSX Server and watching as you fail to connect. Or, you can take my word for it — here are the ports that you need to allow access to:

1. TCP 625 for “Remote Directory Access”, as mentioned on the above page.
2. TCP 8175.

For the last port, the only option in the Server Admin firewall interface is to enable ports 8000-8999 for “Web Service, iTunes Radio streams”. If you are running other services on those ports that you want to protect, or if you’re just paranoid, you’ll want to add a custom rule for port 8175.
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The documentation for setting up sieve on Mac OS X server is sparse, at best:

To enable Sieve support:
1. Add the following entry in /etc/services/:
sieve 2000/tcp #Sieve mail filtering
2. Reload the mail service.

Right. This will enable the service, but it doesn’t configure it. This short article describes how to do both.

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