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NDR report to sender !!!

damiri

Hi,

I ran in to this post "https://community.sophos.com/sophos-email/f/discussions/120683/requeue-e-mails-that-failed-or-send-ndr-to-sender" where we are having issue with 5.1.1 error where we learned hard way that email gw doesn't send back NDR to sender if they misspell email address.

Is this really the way it is or I am missing something ???



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[edited by: Raphael Alganes at 7:36 AM (GMT -7) on 29 May 2023]
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  • 0

    Are you talking about somebody, sending you a Email as a Central Email customer or some of the protected user behind Central Email is trying to send a Email out, which does not exists? 

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  • 0 in reply to LuCar Toni

    Actually, both users exist, on Sophos Email GW and mail server, but Sophos Email GW gets no existing user from email server (we are investigating reason) for some emails (not all emails) and then deletes email without sending NDR to sender.

  • 0 in reply to damiri

    Central will not generate a email back to the Sender. That would cause to much Email traffic. Be careful on this system, that your Email server has the same kind of data as your Central Email instance. 

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  • 0 in reply to LuCar Toni

    Actually, Central will not generate any kind of notification, nor NDR nor some kind of notification to Admins. Everything was setup correctly but due issue with compatibility between Central Email GW and Email server a lot of emails are lost since Central will just DELETE legitimate emails. I have found this very dangerous with Central and we will be moving to some other vendors with better control over this email flow. 

    Sophos is afraid of traffic since it is using AWS as provider. Maybe if they have their own servers like some other vendors, maybe things would be different. 

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  • 0 in reply to LuCar Toni

    Actually, Central will not generate any kind of notification, nor NDR nor some kind of notification to Admins. Everything was setup correctly but due issue with compatibility between Central Email GW and Email server a lot of emails are lost since Central will just DELETE legitimate emails. I have found this very dangerous with Central and we will be moving to some other vendors with better control over this email flow. 

    Sophos is afraid of traffic since it is using AWS as provider. Maybe if they have their own servers like some other vendors, maybe things would be different. 

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