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Incoming emails go to the secondary MX instead of the primary MX when using TLS

    • Updated:
    • 27 Feb 2014
    • Product/Version:
    • InterScan Messaging Security Suite 7.1 Windows
    • InterScan Messaging Security Suite 7.5 Windows
    • Platform:
    • Windows 2003 Enterprise Server
    • Windows 2003 Standard Server Edition
    • Windows 2003 Standard Server Edition 64-bit
    • Windows 2008 Enterprise Server
    • Windows 2008 Enterprise Server Edition 64-bit
    • Windows 2008 Standard Server Edition
    • Windows 2008 Standard Server Edition 64-bit
Summary
The incoming messages from a domain using Transport Layer Security (TLS) are being routed to a secondary MX record while non-TLS messages go directly to the primary MX.
The messages are transferred to the primary MX through the trust relationship between the two MX records.
Below is the mail flow:
TLS Transactions:
domain.com [TLS] > Secondary MX > Primary MX [IMSS]
Non-TLS Transactions:
domain.com > Primary MX [IMSS]
Details
Public
The issue happens when InterScan Messaging Security Suite (IMSS) receives EHLO command from xxx.com. It is in the form of "XXXX xxx.xxx.com". Xxx.xxx.com will send the HELO command, but after IMSS acknowledges it, the remote server cancels the connection.
The XXXX indicates that there is something in front of IMSS that masks the EHLO command. There could be a PIX firewall configured in front of IMSS. You can set up Cisco Pix firewall to disable the fixup protocol SMTP.
For further details on how to disable the feature, consult your Cisco PIX firewall representative.
Premium
Internal
Rating:
Category:
Configure
Solution Id:
1057270
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