Nirvaris is made for speed and not for storage.
IMAP and POP accounts store the emails in our servers. Although this option is available, we recommend you to store and use your emails in a proper email provider, like Gmail.
In order to store your emails in our servers, you must create your email account on CPanel.
Jut browse to www.yourdomain.com/cpanel and log in to your CPanel account.
Look for the session Email and click on Email Accounts:
Create a new account filling up the text boxes as follow:
Enter the new email address prefix (before the @ symbol), select the domain you want to use from the drop-down menu and set up a good password. After that, click the "Create Account" button.
Your new email will appear in the Email Accounts list.
Click on "Set Up Mail Client" if you want to configure your new email on your favourite email client.
You can see the details that you need to set up your email client.
Also some scripts you can use to set up your email client.
More info how to set up your email client: here
If you need any help, please, email us on firstname.lastname@example.org.