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Outbound email not being assigned the right IP - 29.Apr.2008 3:42:09 PM

xavierv

Posts: 4
Joined: 29.Mar.2005
Status: offline

Hi, we have an Exchange 2007 behind an ISA Server 2006. This ISA box have an IP1 used for normal browsing and another IP2 used for email. Rules were created normally using the wizards. Today we noticed two cases which some emails were stamped with IP1(browsing) instead of IP2 (email); because we use SPF records in the Internet to only allow outbound email from IP2, the mails were rejected. Addtionally, ISA Server only allows SMTP traffic from the Exchange server and denies it to other internal hosts.

I have checked the internal DNS configuration with AD and the internal MX record is fine. Our ISP checked the external MX record and it is fine too.

So, my question is why Exchange is stamping the email with this IP1?. Is this an ISA Problem?

Regards,

Xavier

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RE: Outbound email not being assigned the right IP - 30.Apr.2008 4:27:50 PM

Rotorblade

Posts: 976
Joined: 27.Feb.2007
Status: offline

quote:

So, my question is why Exchange is stamping the email with this IP1?. Is this an ISA Problem?

No it's not a problem because it's by design; the primary IP assigned to the external NIC will be used. Add the primary to the SPF record and create a A zone record for the primary and you should be ok.

HTH

RB

_____________________________

David Melvin
Ohio
MCSE: Security 2003, MCSA:Security 2003

(in reply to xavierv)

Post #: 2