Note that some mail gateways and mail servers might strip the Return-Path header before it reaches the user’s mailbox.
The message Return-Path header will be set to domain], where xxxxxxxxx is replaced with a random identifier and the From domain will be replaced with one of the domains specified in the campaign’s email accounts.
() is the host name and IP address of the receiving mail server. Here is an example of Received headers: Received: from (207.67.44.189) by () … Wed, 11:15:05 +0000 Received: from localhost (localhost ) by (Postfix) with ESMTP id NNNNNNNNNN for Wed, 05:15:05 -0600 (CST) The domain should only be in the two oldest Received headers. Barracuda recommends that you check only the domain if you are allow listing by the Received header. Allow these IP addresses for the Security Awareness Training email servers on your email security system or service:Īll SMTP servers sending emails for Barracuda-supplied domains identify themselves in the Received header as. If you decide to allow by domain, include the email server domain you select when you configure the domain.Įmails coming from standard Security Awareness Training servers to your organization will originate from one or more of these IP addresses. If you are not setting up with O365 or using Barracuda Email Gateway Defense, meet with your email security system vendor or administrator to have them allow the Security Awareness Training campaign email domains or the IP addresses for the Security Awareness Training mail servers. As long as that rule is in place, these emails will flow directly to the users' inbox and the Allow List instructions here do not apply.
Important! If you are using Barracuda Email Gateway Defense, or are otherwise setting up Microsoft Office 365, you are instructed to create a mail flow rule that bypasses the additional spam filtering that O365 performs.
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