When creating a user: Accounts → Users → "Create "* you can specify the maximum number of mail domains and mailboxes that this user can manage.
When adding a domain: Domains → Domain Names → "Create "
You can also create a Mail Domain in the menu: Domains → Postal Domains
After setting up your email domain, you need to create mailboxes in Accounts → Mailboxes
Enter the name of the box in the Name field.
Setting up email clients
Once you have created a mailbox, you need to add it to your mail client. See Accounts → Mailboxes → "Settings " for details
You can also download ready-made autoconfiguration files for email clients here
ISPmanager has Roundcube mail client installed by default (ISPmanager → Advanced Applications), which allows you to work with mail through your browser.
This guide for the updated ISPmanager5 control panel design, available here.
If you have any configuration difficulties or have additional questions, you can always contact our support team via ticket system.