SquirrelMail use unix users, so just add users to you system.
via terminal "adduser"
http://sms.it-ccs.com/wiki/#LinkTarget_1734
via webmin
http://sms.it-ccs.com/wiki/#LinkTarget_1218
...
Okay, Everyone can tell I am new to SMS, so please be kind.
I have installed sms on virtual box for learning purposes. I want to add family members for my house e-mail server. AnyOne got Ideals
[/b]