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In my experience Yahoo has a lot to answer for their weak security,
spammy mail accounts and dodgy spam history..<br>
<br>
They are the last company to be bleating on about security given
their poor track record.<br>
<br>
Personally, watermarks stops backscatter and allows for NDRs to be
handled more efficiently.<br>
<br>
If the price paid for that is not being able to email Yahoo, then
so be it.<br>
<br>
P.<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 23/02/2015 14:32, Scott B. Anderson
wrote:<br>
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cite="mid:4dccf09f7a624c39a8aa005b6c5d12bc@ES5.impromed.com"
type="cite">
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<pre wrap="">-----Original Message-----
From: <a class="moz-txt-link-abbreviated" href="mailto:mailscanner-bounces@lists.mailscanner.info">mailscanner-bounces@lists.mailscanner.info</a> [<a class="moz-txt-link-freetext" href="mailto:mailscanner">mailto:mailscanner</a>-
<a class="moz-txt-link-abbreviated" href="mailto:bounces@lists.mailscanner.info">bounces@lists.mailscanner.info</a>] On Behalf Of Chris Chapman
Sent: Saturday, February 21, 2015 11:41 AM
To: <a class="moz-txt-link-abbreviated" href="mailto:mailscanner@lists.mailscanner.info">mailscanner@lists.mailscanner.info</a>
Subject: DKIM and MailScanner Watermarking
MailScanner - v4.84.5
I have been running into an issue regarding DKIM with MailScanner and wanted
to see if anyone had some input.
Out of the blue, Yahoo started rejecting messages from our servers with the
error "554 Message not allowed - [299]”. While the messages were certainly not
spammy, I noticed in their documentation the line "For example, it is against
Yahoo Mail's policy to accept messages with malicious content or manipulated
header information…”
This led me to wonder about Watermarking, as the feature adds a few header
lines to messages. I found if I disable watermarking in MS, messages deliver as
expected. Re-enable Watermarking, I get bounces.
In the process of tracking down the cause, I ran a DKIM test, found at
<a class="moz-txt-link-freetext" href="http://appmaildev.com/en/dkim/">http://appmaildev.com/en/dkim/</a>
With Watermarking enabled, the DKIM tests fail with the error “Wrong body
hash”. Disable watermarking, the DKIM tests pass. It seems to me the
watermarks are added *after* the DKIM body hash is generated, invalidating
DKIM. I believe this is the reason Yahoo is bouncing mail. But even if I disable
DKIM, messages will continue to bounce if the watermark headers are present.
So the DKIM may or may not have anything to do with it.
I have verified the Watermark Header, %org-name% and %org-long-name% do
not contain special characters, dots, underscores or spaces and the like.
Does anyone have any experience/input?
Thanks!
Chris Chapman
</pre>
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<pre wrap="">
I also have run into this issue. It started late last year with Yahoo rejecting replies and forwards but not original messages.
I do not use DKIM at my site. I set :
Multiple Headers = append
Place New Headers At Top Of Message = yes
This seemed to make Yahoo stop rejecting replies and forwards, FWIW. Not sure what else this might break in your configuration.
I am not certain why this helped, it would seem contrary to the help text around these options.
Also, it would appear you could make this a ruleset, so you could set Yahoo.com to append and everything else to add, as the help text suggests.
Scott Anderson
...
</pre>
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