Barracuda does this all the time. It drives me fruit, it requires that I
use my webmail to send the message. The administrator on the other end
never knows how to fix their Barracuda box.
On 4/27/2011 9:34 PM, Noel Jones wrote:
On 4/27/2011 9:16 PM, Michael B Allen wrote:
Hi,
When I send email from home through my Postfix server my home dynamic
IP is included in the Received header:
Received: from nano.foo.net
(pool-98-190-153-84.nwrknj.fios.verizon.net [98.190.153.84])
(using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
(No client certificate requested)
(Authenticated sender: whomever)
by mail.ioplex.com (Postfix) with ESMTP id 13CC658010;
Wed, 27 Apr 2011 20:25:20 -0400 (EDT)
Someone actually just outright rejected a message because of this.
Meaning even though the message was sent from a squeaky clean fixed IP
server on the Internet (mail.ioplex.com), their filter walked back
through the Received hosts and totally rejected the message because it
originated from a dynamic IP.
Is there any way to configure my mail.ioplex.com postfix install to
leave out this part of the Received header or rewrite it so that it
looks like the message is simply coming from mail.ioplex.com such as
if I used webmail?
Also, how common is this level of filtering? It seems excessive to me
but I have to wonder how much of my emails sent from home are ending
up at the very least flagged as SPAM.
Mike
Some anti-spam appliances have a checkbox for this, calling it "deep
inspection" or such. It gets checked because it sounds cool without the
owner understanding that it's likely to reject far more legit mail than
spam.
I feel your pain.
You can use header_checks to either remove (IGNORE) or mangle (REPLACE)
the offending header.
Something like (untested)(all one line):
/^Received: from .*\(Authenticated sender: .*by mail\.ioplex\.com/ IGNORE
or (three lines):
IF /^Received: from .*\(Authenticated sender: .*by mail\.ioplex\.com/
/^Received: (.*)$/ REPLACE X-Submit: $1
ENDIF
Of course, then you have the problem that some other folks who configure
their appliance to add spam points for mail with no Received: headers.
So it's hard to please all the idiots at once.
-- Noel Jones
