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>I want to backup mx a server that is *not* accessible via default |
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>port 25. |
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>Is there a way to configure the backup mx in that way it sends data to the |
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>master server port != 25? |
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> |
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> |
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port is not part of MX dns record, it is always 25 |
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therefore no, you cannot have a backup MX pointing to another port |
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of course, you can configure your smtp server to listen on any port you |
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wish, |
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but it won't help you with respect to the outside world |
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the only possible solution would be to have two ip addresses on one |
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interface, run backup instance of |
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postfix on another port and redirect secondary ip address port 25 to the |
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port of the backup postfix instance |
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but this assumes having two (external) ip addresses available |
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regards, |
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martin |