1. Fake - will not actually send e-mails, no risk of accidentally e-mailing a client then
2. Testable - you can create the server in code, then test your e-mailing functions and check the server to confirm they have been sent
3. Configurable - you can add as many hosts as you want listening on different ports
4. Expendable - you can write you own message storage, perhaps to store in a database
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