[BlueOnyx:17188] Re: TalkTalk bounce

[Ken Hohhof]

I have seen this as well (but a few years ago) when some administrator 
mis-configured a Barracuda to look at the sender's IP address.  Barracuda 
has a name for this option, I can't remember it now.  But yes it will block 
all sorts of mail from dynamic IP blocks (DSL, etc.) for poor reputation. 
It is a configuration mistake, it is the reputation of the mail relay that 
should be taken into account, and in turn the operator of the mail relay 
determines who to trust (typically via SMTP AUTH).

But it is common for the mail system administrator to proclaim to their 
customers that they are right to block this evil mail from bad actors with 
poor reputations.  They will blame the sender, saying "tell them to stop 
spamming".

The solution is probably to tell the sender to use webmail, so his IP 
address does not show up in the headers.  Most of the big mailbox providers 
like GMail and Yahoo Mail I think have gone to this approach even for SMTP 
mail, they suppress the headers from before it hit their system.  So a badly 
misconfigured Barracuda or similar anti-spam appliance has nothing to look 
at and get upset over.


-----Original Message----- 
From: Chris Gebhardt - VIRTBIZ Internet
Sent: Wednesday, March 04, 2015 12:17 PM
To: blueonyx at mail.blueonyx.it
Subject: [BlueOnyx:17179] Re: TalkTalk bounce


On 3/4/2015 9:31 AM, Colin Jack wrote:
> We are seeing mail sent from one of our relay servers to TalkTalk email 
> addresses bouncing off their mail servers:
>
> "554 Your access to this mail system has been rejected due to the sending 
> MTA's poor reputation."

This wouldn't, by chance, be a Barracuda system that is throwing the
error?    I've never been impressed with those devices, but it appears
they are especially inept at identifying the actual relay instead of the
origination point...

Unfortunately I don't have any great advice to help you fix something
that is broken on the receiver's side.   My take would be to pass the
obvious error to them, and let their service provider sort it.  After
all, it's their service provider's problem.  The trouble isn't with your
box.  (My guess is you're just easier to reach!)
-- 
Chris Gebhardt
VIRTBIZ Internet Services
Access, Web Hosting, Colocation, Dedicated
www.virtbiz.com | toll-free (866) 4 VIRTBIZ
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