Many of these dot-coms charge a fee for their services, but there are still a lot of great free tools available online. Free tools, such as those below, are great because, well, they're free. But you also get what you pay for, or in this case, what you don't pay for. Most free email accounts are Web-based, meaning that you must have some access to the Internet in order to access your email. Be sure to check out their privacy policies and understand what they do or don't do with your email address.
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Use caution when setting up a free email account for your organization, since there is no guarantee for how long these services will be offered. Free Email Address Directory lists more free services. While they say that they will not sell or share your name or email address without your permission, they do require you to provide some information for their advertisers. Be sure to read their privacy policies carefully before disclosing any personal information. Whenever using free Internet tools it's important to make sure that they serve your needs.