You can even do it with non-static IP's. There are services that provide DNS names for dynamic IP's. Only problem with mail is that these are often blocked because SPAMMERS love to use this service.
Static IP's are safer and really the way to go.
If you need more detail on how to configure anything, just ask.
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"Our lives begin to end the day we become silent about things that matter."
Rev. Martin Luther King, Jr.
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