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hornbill internal server IP


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Hi Guys - we are setting up a mail banner that flags external emails to our users 


we are looking to add hornbill to our safe senders list so the service desk emails (that come from hornbills servers but spoof our domain address) dont get flagged,


is it possible for us toto be provided with Hornbills internal mail server IP server range so we can add this in? 


happy to continue discussions via private message if required as i appreciate you might not want to publish this on the forum,


many thanks 


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  • 2 weeks later...

Hi @James Ainsworth - sorry to revive this, for the most part this is working, but ive noticed the emails that come from "noreply@hornbill.com" dont seem to come from the same IP's as in the article? 


this is what we see one one that works as expected and comes from our helpdesk mailbox



Received: from [] (helo=live.hornbill.com)

                by out6b.electric.net with esmtp (Exim 4.94.2)

                (envelope-from <itservicedesk@alexander-dennis.com>)

                id 1ltrPd-0001xa-TF

                for GD-IT-ALL@alexander-dennis.com; Thu, 17 Jun 2021 05:46:25 -0700

Authentication-Results-Original: in6i.electric.net;              iprev=pass


this is what we see from one that is not working, and appears to come from noreply@hornbill.com as you see it seems to come from somewhere different? 

is this to do with it being a no reply mailbox perhaps?




Received: from live.hornbill.com (unknown [])

                by live.hornbill.com (Postfix) with ESMTP id 16D881401FD

                for <gary.exley@alexander-dennis.com>; Mon, 21 Jun 2021 11:28:39 +0000 (UTC)

Authentication-Results-Original: in4j.electric.net;              iprev=fail



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