Following features are not documented, and some of them, are not widely tested. They are intended for advanced users only.
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Create a text file with the same name, as the domain name in the mail server program directory, and place in that file names of mail exchangers for that domain, one exchanger per domain. You can create the file manually, or, you also can go to Tools - Domain Info, run a test for the domain, then right click the results window, and select Save MX Records option. To restore defaults, delete the file. It has to be done manually
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