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Notification emails being blocked by antispam sender blacklist


We have our email servers hosted internally, so a recommendation to stop email spoofing is to reject any external incoming email with our email domain as a sender. So I setup an antispam sender blacklist blocking all emails supposedly from our domain (* This though causes a few issues, one main one being that notification emails  from the UTM to an email address on our domain are now blocked by the blacklist, and exceptions do not work (I know abut this request I saw a workaround using a DNAT rule, but this doesn't work either as the source server is localhost ( and I can't make a Network definition with that IP, unless there is a magic way of using that IP in a DNAT rule.... which relies on the UTM being secure... which I hope it is...

Is there anyway around this... or will I have to not use the blacklist filter....



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