Rejecting Forged Headers From Foreign IP Space. (Doc ID 2077733.1)

Last updated on NOVEMBER 16, 2015

Applies to:

Oracle Communications Messaging Server - Version 7.0.5 and later
Information in this document applies to any platform.

Goal

Customer's anti-spam vendor reports seeing a large amount of spam with SMTP HELO/EHLO forged as the customer's domain names, even though the SMTP client IP is not in a range owned by the customer.

Configure the MTA to reject sessions for IPs using the customer's domain name in the HELO/EHLO field of the MTA transaction.   Allow only a specific range of IPs to HELO/EHLO using the hosted domain name.

Solution

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