Need help with email bounce back problem

Hewit packard / DX2300
July 13, 2010 at 01:30:02
Specs: Windows XP
Help on solving our email bounce back
situation and others:

We are experiencing a certain amount of
emails that cannot be delivered (especially
Yahoo) and now and then we have a major
issue with no emails been able to be sent due,
to on one occasion our IP address said to
been blacklisted (but I cannot confirm this).
We corrected this by having our ISP reset our
IP address. Our email and website hosting
Service Company has always maintained that
it is a problem with our ISP.

I want to stress that we do not send spam

On the last time this happened again our
Hosting company claimed it was our ISP
again, but our IP address was not black listed
on popular a web site After I pointed
this out to them the problem soon corrected
itself, but still we cannot email yahoo

Our website and email hosting company has
told us that the only way to get around this
problem is to take on their service of VPS
(Virtual Private Server) – this would prevent the
problem but it comes at a considerable
increase to our current hosting cost.

My question is – is this true? Do I need to do
this VPS to avoid this problem OR does the
problem sit with my hosting company?

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July 13, 2010 at 14:31:38
"but our IP address was not black listed
on popular a web site"

The tool on that website doesn't necessarily check all existing blacklists, so your results there might be a false positive (or negative, depending on how you look at it).

This is actually pretty common. Often, entire blocks of IP addresses are blacklisted without regard for individual addresses within the block. This is an easy (albeit crude) method of blocking mail from ISPs who do or may host spam mailservers. Sounds like you might have gotten caught up in the dragnet.

The problem does sit with your hosting company, in that they own the blacklisted IP address block. You can request that your IP address be removed from a blacklist, but it will likely get re-added to the list eventually. And there are many, many blacklists.

Your best bet may be to use the VPS service, or find a co-location host for your mailserver.

Also, could you post one of the bounce messages for analysis? It's possible the bounce is not caused by blacklisting, which the bounce message should confirm or deny.

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July 13, 2010 at 20:45:31
Below is a bounced back message:

Your message did not reach some or all of the intended

Subject: FW: Questions
Sent: 14/07/2010 07:37

The following recipient(s) cannot be reached:

'Darby Anico' on 14/07/2010 07:37
550 5.7.1 Relaying to <> denied
(authentication required)

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July 14, 2010 at 08:36:33
You have mentioned your ISP and your hosting company. Can you give a little more detail about how your stuff is setup?

Where is your mail server located - on your ISP's network, or the network of your hosting company?

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