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Any of the above distros wouldn't hurt...
...but if you feel like a challenge, Debian or a late-stage (2 or 3) Gentoo would probably do you.
I have no reasoning to back up that they're "better" as a mail,ftp,web server (and I doubt they are better than any other distro.. it's all the same if you know to stop programs that distros may run by default)... there's just a little bit more involved in installing/running them, as it isn't all GUI-based.
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