The character set allowed in the Domain Name System is based on ASCII and does not allow the representation of names and words of many languages in their native scripts or alphabets. ICANN approved the Internationalized domain name (IDNA) system, which maps Unicode strings used in application user interfaces into the valid DNS character set by an encoding called Punycode. For example, københavn.eu is mapped to xn--kbenhavn-54a.eu. Many registries have adopted IDNA.
Ultimately, it boils down to a balance between cost, features, and risk. It's always tempting to simply jump on the lowest-cost solution, but the fact that email is ubiquitous keeps this from being the smart play. It's nearly impossible to escape using it, which means your users, your customers, and the guts of your business have all come to depend on it in different ways. You need to discover those ways, evaluate them, and then choose a service that either meets or improves on them. This takes time, discussion with your IT staff, and some investigation; these are steps you don't want to skip. Otherwise, you'll pay for it later.
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The flip side of that coin is specialization. Many operators believe that hosted email services are useful mainly to companies interested only in general-purpose email use and that any specialized application requires an in-house deployment. This might be true depending on the app but it might not depending on the capabilities offered by the hosted email provider. Email marketing is a great example. Some hosted email providers have special service suites aimed specifically at email marketers, many of whom can send out thousands of emails per month, focused not so much on communication as they are on marketing. These service providers deliver more than just volume, too, as they also offer custom email creation tools and sophisticated marketing and tracking metrics.
A fully qualified domain name (FQDN) is a domain name that is completely specified with all labels in the hierarchy of the DNS, having no parts omitted. Labels in the Domain Name System are case-insensitive, and may therefore be written in any desired capitalization method, but most commonly domain names are written in lowercase in technical contexts.