Editing internal users

Main settings

Password
user's password.
Max Mailbox Size
maximum mailbox size that limits amount of mail which can be stored in the mailbox.

WebMail Settings

Use Friendly Name in "From:" field
tells if friendly name ("Name" field) should be added to "From" field of outgoing messages.
Get/Synchronize Mails at login
forces WebMail to automatically start receiving message after logging user in.
Allow user to change email settings
allows/disallows users to change e-mail settings.

Aliases

Aliases are e-mail address synonyms. Aliases work within the same domain only, i.e. you can add pure usernames only, domain part of resulting e-mail address will be the same as domain of the account the alias belongs to. All messages sent to any alias will be delivered to the account the aliases point to.

Forwards tab

All messages sent to account the forwards belong to will be automatically sent to the specified e-mail addresses. Forwarded messages are also stored in accounts they originally sent to.