There are hundreds of E-mail providers out there, and all of them are different in one or the other way.
We made an attempt to create a universal infrastructure to manage all possible E-mail providers in unified manner.
This does not mean that the software supports all possible E-mails out-of-the-box. It wouldn't be possible because of so many peculiarities that each provider has. However, the software provides a platform that potentially is able to support any given E-mail provider, if configured properly.
This is achieved via a concept of E-mail managers. Basically, an E-mail manager is a software layer between the actual E-mail account and the rest of the software, that unifies such functions as account creation, downloading E-mail messages, validating accounts etc. It can also be thought of as a "driver" that allows to manage different E-mail providers, similar to how Windows manages different storage devices (hard drives, CD's, flash disks, diskettes etc.) in a unified manner, via a particular hardware driver.
Each E-mail provider must have a corresponding E-mail manager registered in the software. For example, if you need to use @gmail.com and @hotmail.com accounts, then you need to have 2 E-mail managers in the software - one for Google mail and the other one for Hotmail. However, if you also want to add @googlemail.com and @live.com E-mails to that list, you will still need only 2 E-mail managers, because @googlemail.com is just another domain for Google mail accounts, and @live.com - is a subset of Hotmail.
Each E-mail manager has a number of configuration options. First of all, it is the settings for E-mail retrieval, also known as POP3 settings.
The software is shipped with a list of pre-configured E-mail managers for the most commonly used E-mail providers. You can find them under the E-mail->E-mail managers tab in the software. When you double-click on any of the managers in the list, you will see the settings area, where you can change the configuration should the need be.
Adding your own E-mail managers
If you have E-mails with your own domain and POP3 support that you would like to use in the software, you will need to configure a corresponding E-mail manager. This also applies if you want to use E-mail provider that is not directly supported by the software (you do not see it in the list of E-mail managers), but you know their E-mail accounts support POP3.
In this case, you need to go to the E-mail->E-mail managers tab in the software and click on the Plus button. Pick a name and title for your E-mail service and enter POP3 configuration information. Click OK and now you should be ready to import your custom E-mails into the software and use them.