Is Hosted E-Mail Right for Your Organization? - Reliability (
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In theory, reliability should be one of the hosted e-mail provider's strongest suits, given an infrastructure devoted to e-mail that's typically broader and deeper than what makes sense for a single company to invest in for itself.
It's important to evaluate the processes that potential hosted e-mail providers have in place for ensuring reliability, to discuss the sort of SLAs (service-level agreements) with which these providers are prepared to back their offerings, and to see how these provisions and guarantees stack up against what you are prepared to provide in-house.
What's more, not all of the infrastructure that hosted e-mail services require lays in the hands of the provider. Most dramatically, the Internet link between you and your hosted e-mail provider can be subject to interruption, leaving your organization disconnected from a vital service.