Servers running Plesk let you create email addresses at the domains hosted on your account.
Note: Your Mailbox's size counts toward your account's Disk Space Usage.
After creating email accounts, you can either check them with webmail (requires DNS changes) or use an email client.
If your Plesk email accounts aren't working, you probably need to update your domain name's email settings (technically known as its DNS zone file's MX Records) — we've got that information for you in Configuring DNS for Your Plesk Domain.