If you use cpanel for hosting your website, then all mail features can be managed through the web. One of them manange all mail accounts can be managed through a web-based application cpanel. Do you know if you add a user mail can also be done through ssh console? following his tips and tricks:)
But this did not set the email quota for the user.
I figured out That if I edit
/home/account_name/etc/yourdomains.com/quota and add a line with
it takes care of the quota setting.
note: 1K of quota = 1024, 1M = 1024×1024
I hope a little tutorial can help: D