IMAP is limited to 20 connections per IP address, but that shouldn't be an issue for most users. When you read, reply, delete, forward, or otherwise manage your email, the changes are made on the server and sync with your webmail and other IMAP-connected email clients.
The protocol you'll use mostly depends on the number of devices you'll use to access your email. Your email application can be set up to retrieve email from the email server using one of two different protocols: IMAP or POP. If you'd rather access your email account online, refer to Accessing Webmail for more information. This article explains what configuration settings you should use and links to our setup guides for the most common email clients. Once you've created an email account, you can access and manage your mailbox by setting up an email client on your desktop or mobile device. HostMonster Web Hosting Help How To Setup Email Account - Client Setup SSL/TLS Settings - POP & IMAP