What you need to host an e-mail server
Your server needs to be available through a permanent Internet connection with a fixed IP address. In theory, it is possible to run an e-mail server with a non-fixed (dynamic) IP address but it will not be reliable when the IP address is changed, and you will risk losing messages. With a dynamic IP address, you will also face a bigger risk of being put on one of the blacklists for dynamic IP address ranges.
If you are serious about running an e-mail server, get a decent business-class Internet connection. These are relatively inexpensive these days, and investing in one will save a lot of trouble later on. E-mail traffic does not depend on high bandwidth, so the capacity of a simple DSL line should be more ...
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