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Could anyone points me to right rules to prevent sending/receiving messages to/for domains which have one MX to localhost or only have address 127.0.0.1 ?

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Could anyone points me to right rules to prevent sending/receiving messages to/for domains which have one MX to localhost or only have address 127.0.0.1 ?

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• Q0719: I would like to have a per-user limit for the maximum size of messages that can be sent.

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