Emails are not stored locally with an IMAP account, which makes it useful if the mailbox is synched between several clients (computer, smartphone, etc.). The IMAP account enables you to access messages directly on the server, just as if you were going to.This is the simplest and most common setting for an e-mail client. The POP account enables you to “download” messages from a server to a computer.You can look up the punycode for an international domain here. If you use an internationalized domain name, or a domain name with international characters, you may need to use the punycode version of the domain with some email clients.
Be sure you follow the settings instructions carefully.
