The following Mac Eudora plug-ins are available here:

Personalities_Ports Allows you to change ports, etc. per-personality. Updated October 24, 2001

Special_Tweaks Updated October 24, 2001 Allows you to set a few of my favorite special Mac Eudora tweaks:

Download the file, decompress it, and drag into your Eudora Items folder. Quit and relaunch Eudora.