But I would imagine that it is configured to for mail specifically regarding Joomla (eg lost password etc). It may be able to be reconfigured to do both but I am unsure and have no experience with it. Have a look at the Ubuntu server documentaion around email here (TKL v11.x is Ubuntu 10.04 under the hood).
If you are looking for a fuller featured mail server tied in with a Webmail type solution then perhaps have a look at the iRedmail TKLPatch provided by Adrian, there is some background to this endevour provided here (where Basil initially looked at iRedmail). You may be able to apply the patch directly to your Joomla install although it may cause some unexpected results so back up everything first (TKLBAM would be a good option IMO).
There are numerous other alternatives if you'd prefer such as SquirrelMail, RoundCube and Horde (Google should provide you with some links).
Postfix already installed
But I would imagine that it is configured to for mail specifically regarding Joomla (eg lost password etc). It may be able to be reconfigured to do both but I am unsure and have no experience with it. Have a look at the Ubuntu server documentaion around email here (TKL v11.x is Ubuntu 10.04 under the hood).
If you are looking for a fuller featured mail server tied in with a Webmail type solution then perhaps have a look at the iRedmail TKLPatch provided by Adrian, there is some background to this endevour provided here (where Basil initially looked at iRedmail). You may be able to apply the patch directly to your Joomla install although it may cause some unexpected results so back up everything first (TKLBAM would be a good option IMO).
There are numerous other alternatives if you'd prefer such as SquirrelMail, RoundCube and Horde (Google should provide you with some links).