So I got ISPConfig up and running good, installed the squirrelmail .pkg and am able to log in. I can even send and recieve e-mails! who0t! but here is my problem. when I send an e-mail the 'from' address is username@example.com. It looks like it shows the correct user name, but not the correct domain? how/where do I correct this? Thanks in advance.
under Options >> Personal Information there is a section for 'E-mail Address:' If I manually set that it appears to be fine. Is there a way to set this so it automatically changes it for new users?
No, you must set this manually, just as you do in every regular email client (such as Outlook, Thunderbird,...).