hMailServer is an e-mail server for Microsoft Windows. It allows you to handle all your email yourself without having to rely on an Internet service provider (ISP) to manage it. Compared to letting your ISP host your email, hMailServer adds flexibility and security and gives you the full control over spam protection.
hMailServer is used by a lot of different types of users. Here's some examples:
Anyone with an email address may benefit from using hMailServer. Typically, organizations and persons who have registered a domain name on the Internet use hMailServer to host email for this domain.
No, you can run hMailServer without being connected to the Internet, with the obvious limitation that you cannot send email to other people on the Internet.
That depends mostly on the hardware of the computer where hMailServer runs and what type of users you have. For example, if your users are very active, you need a faster server compared to if your users does not check their email often. There are hMailServer installations with tens of thousands of users accounts on a single server.
The first thing you need to do is to determine what you want to use hMailServer for. After that, follow the installation tutorial.
That depends on how you plan to use hMailServer. If you want to host email for your own domain, you should add a domain and user accounts to hMailServer. The steps to do this are described on this page: Basic configuration
This is a common error message which in most cases is caused by an incorrectly configured email client. Please check the following pages for information about error messages: Error messages
It is unnecessary from a technical point of view to have multiple host names resolving to the same IP address. As long as the host name you are using is pointing at the correct IP address, it does not matter what the name of the host name is.