The next section outlines the troubleshooting process to determine the reason behind the actions taken by this Anti-Spam filter. There will be scenarios where customers open support requests wanting to understand why the Anti-Spoofing filter blocked or allowed specific messages against their expectations.
IntroductionĪnti-Spoofing is an anti-spam filter that is designed to block emails originating from spoofed addresses which are emails from one of the local domains but which were sent from an unauthorized IP address. In this article, you will learn how to determine why the Anti-Spoofing engine blocked or allowed a message as part of the troubleshooting process. If the sender IP address is not on the list of own-domain server IP addresses, the email is blocked as the sender information is forged. Make sure that your local SMTP server's IP address is added to the Perimeter Server configuration.The Anti-Spoofing Filter is one of the filters in the Anti-Spam chain that works by checking emails received with a sender email address claiming to originate from your own domain against a list of IP addresses known by MailEssentials. Obtain the complete list of IP's from the Office 365 URLs and IP address ranges article.Īdd the missing IPs to the list as described in the Enabling and configuring Anti-Spoofing article. Some of the listed IP ranges are missing in the antispoofing filter configuration. Antispoofing logs consistently show that emails originating from these IP's are considered spoofed: ,12:56:37,665,1,"#00002d08","#000004fc","info ","ase_antispoofing","Connecting IP "
Internal emails are marked as spoofed in an Exchange and 0ffice 365 hybrid environment.
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