Logging in on 2 accounts simultaneously. Possible?

Hi all,

I have run into the following issue.

I want to access 2 different mail accounts on the same Squirrelmail system. I first log in on account 1, and then on account 2 in a different tab/window. However, when I then click on ‘Check Mail’ in the window for account 1, it ‘refreshes’ to show the info for account 2!
This happens with IE, FF & Chrome, so I am pretty sure the problem is on the server-side…

This server uses Debian, with Squirrelmail 1.4.15.

smtpd_client_restrictions is ‘Optional SMTP server access restrictions in the context of a client SMTP connection request’.