All Linux flavors are made from Kernel + Base packages + other software. Mail server is software that do particular job. Various mail server products with different pluses and minuses in features suit for different situations. Any working Linux flavor that having latest kernel and mail server software plus minimum other packages (needed for function as OS) should exactly match to you. Minimum other software means lower possibility for vulnerabilities.
"If you can prepare a house that doesn't have weak walls or low strength areas, if any one can’t feel that it have valuable items in it just by looking it from outside, no one making a try to enter it or do damage. Up to certain extent thieves doesn’t try to enter it, means have protection...secure."
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mail server ?
