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\nabc.exampl.co.jp.\tIN MX 10 filter.exampl.co.jp.
\nabc.exampl.co.jp.\tIN MX 20 mail.abc.exampl.co.jp.
\n\u3068\u66f8\u3044\u3066\u3001@abc.exampl.co.jp\u3000\u5b9b\u306e\u30e1\u30fc\u30eb\u306ffilter.exampl.co.jp\u306b\u9001\u308c\u3068\u3059\u308b\u308f\u3051\u3060\u3002\u4f55\u3089\u304b\u306e\u7406\u7531\u3067filter.exampl.co.jp\u304c\u52d5\u3044\u3066\u3044\u306a\u3044\u3068\u304b\u8a70\u307e\u3063\u3066\u3044\u3066\u5fdc\u7b54\u304c\u9045\u308c\u308b\u3068\u304d\u306f\u3001mail.abc.exampl.co.jp\u306b\u9001\u308b\u3068\u3044\u3046\u5b89\u5168\u5f01\u3082\u66f8\u3044\u3066\u304a\u304f\u306e\u304c\u666e\u901a\u3089\u3057\u3044\u300210 20 \u306f\u512a\u5148\u9806\u4f4d\u3067\u5c0f\u3055\u3044\u307b\u3046\u304c\u512a\u5148\u3055\u308c\u308b\u3002
\n\u901a\u5e38\u306fabc.exampl.co.jp\u5b9b\u306e\u30e1\u30fc\u30eb\u306f\u512a\u5148\u9806\u4f4d\u306e\u9ad8\u3044filter.exampl.co.jp\u306b\u9001\u4ed8\u3055\u308cfilter.exampl.co.jp\u304c\u30d5\u30a3\u30eb\u30bf\u3092\u901a\u3057\u305f\u5f8cmail.abc.exampl.co.jp\u306b\u8ee2\u9001\u3059\u308b\u3002
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\n\u30e1\u30fc\u30eb\u3092\u9001\u4ed8\u3059\u308b\u30b5\u30fc\u30d0\u306ePostfix \u306erelayhost\u306b
\nrelayhost = abc.exampl.co.jp \u3067\u306f\u306a\u304f
\nrelayhost = [abc.exampl.co.jp] \u3068\u66f8\u304f\u3068MX\u30ec\u30b3\u30fc\u30c9\u306e\u512a\u5148\u9806\u4f4d\u3092\u7121\u8996\u3057\u3066\u3044\u304d\u306a\u308aabc.exampl.co.jp\u306b\u9001\u4ed8\u3067\u304d\u308b\u3089\u3057\u3044\u3002
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\nMX\u30ec\u30b3\u30fc\u30c9\u3067\u5b89\u5168\u5f01\u3067\u3042\u308b
\nabc.exampl.co.jp. 12345 IN MX 20 mail.abc.exampl.co.jp.
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