SquirrelMail with ISPConfig, CentOS

First:
I can access with username (web1_test), but i can´t access with email ([email protected]). How can I to access with email????

Second:
When i try to send attachemnt that size is more that 2 Megas, dont´can send it. How can I incresed sizes of attachemnts????

But I can recive mail with attachments big, I recive one attachemnts size 8 Megas.

 

Hi,

On the domain configuration, check "Mailuser Login: "

Bye

 

I'm not find this options. Can you tell me where is it?
This is the menu:
1. Organization Preferences
2. Server Settings
3. Fodler Defaults
4 General Options
5. Themes
6. address Books
7. Message of the Day (MOTD)
8. Plugins
9. Database
10. Languages

 

It's on ispconfig configuration not squirrelmail configuration

On the domain configuration

 

Ok, I already saw it. This active one the stall, disables it to him and I even continue entering equally. Active or disabled.

ISP Site, is several options and this that of MailerUser Login and even side a stall.