Where exactly do you see this email? Is it a default email, where admin is your actual login into Directadmin panel? If so, you can not have a separate password for the email account, as it is a system account, not a virtual one.
Where exactly do you see this email? Is it a default email, where admin is your actual login into Directadmin panel? If so, you can not have a separate password for the email account, as it is a system account, not a virtual one.
Your domain is hosted under your main admin login for the server. It's a system account and cannot be changed except by changing the main admin account for the server. That's also why it can't be deleted.
Note that forwards work differently for system accounts (login names and admin) than they do for virtual email accounts. For system accounts if you set up a forward, no email will go to the main mailbox, but for virtual accounts email copies will go to both the account mailbox and the forward.