I was referring to TCP header re-writes. But, now that I think about it,
the re-write would have to happen at the Exchange level after receipt.
(Can't do it pre-send unless the entire message fit in a single packet.
So... that's not going to work).
Since this is the case, then I will probably have to migrate the spam
filter to happen at the Postfix proxy, which requires we write a
connector to their CRM system. Not a big deal, but not as easy as I was
hoping.
Now, back to the proxy setup? Where should I start reading?
On 06/09/2015 12:11 PM, Viktor Dukhovni wrote:
On Tue, Jun 09, 2015 at 12:04:56PM -0400, Michael Munger wrote:
One item of particular concern is header re-writes. I would prefer to have
postfix retain the original sender IP address ...
What you call "the sender IP address" is not message (header)
content. Rather, it is the IP address part of the TCP client's
(address,port) pair associated with the TCP connection between the
SMTP client and server.
There is nothing that Postfix can do to preserve this when it
connects to the Exchange server. The IP address Exchange will see
will be that of the Postfix server. IP-based anti-spam processing
will have to be performed by Postfix, not Exchange.
--
Michael Munger, dCAP, MCPS, MCNPS, MBSS
High Powered Help, Inc.
Microsoft Certified Professional
Microsoft Certified Small Business Specialist
Digium Certified Asterisk Professional
mich...@highpoweredhelp.com
