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I've done this before but cannot remember how. We have another Linux server that is kind of like our utility server for the network. It is not on the same domain as Zimbra but I'd like to allow it to send messages concerning crontab failures to my Zimbra account. It has an internal domain name that isn't externally assigned to it, and it used to work. Not sure why it doesn't anymore.
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Allowing email from another server 
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