Re: Static IP address blocked by anti spam lists
- From: "Lanwench [MVP - Exchange]" <lanwench@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 9 Feb 2006 11:02:01 -0500
In news:5E75D9A1-C6CC-4BC3-AD12-6A7CEEE24A03@xxxxxxxxxxxxx,
Oswaldo <Oswaldo@xxxxxxxxxxxxxxxxxxxxxxxxx> typed:
Hi,
I have SBS 2003 hosting our website and email using Exchange, I have
a DSL line with a static IP address that my ISP provided and
everything was working fine until I started getting rejected emails
because our IP address is listed as spam or as a dynamic address. I
contact one of these lists asking them to remove us and they told me
this:
Unfortunately, the IP address XXX.XX.XX.XX is not eligible for
unblocking. This IP address comes from a cable/dsl/dialup pool, or
other dynamic IP pool. Connections coming from a pool are nearly
impossible to trace back to the originating computer. It is for that
very reason that cable/dsl/dialup pools are very commonly used by
spammers and virus writers.
If you are an end-user in a cable/dsl/dialup pool, then you should
configure your mail software to send outgoing mail through your ISP's
dedicated outgoing mail server. The server is usually named
'smtp.example.com' or 'mail.example.com'. The ISP's support line will
be able to give you more details. We have whitelisted the mail server
of most major ISPs, so the mail will get through if sent through
these systems.
If you are the server admin, you can create a reverse DNS PTR record
for the IP address involved and map it back to the name given in the
MX record. If there are multiple MX entries, the rDNS PTR record will
need to be done for each. We can not assist with the creation of
these records. Once created and propagated you can submit a request
again so we can review the IP in question and determine if it is
available for unblocking.
I don't have much experience with Exchange and I don't know how to
configure Exchange to send outgoing mail through my ISP's dedicated
outgoing mail server or how to set up the PTR record but I think that
the PTR has to be set by my ISP right? I have the MX pointing to my
IP and I can send and receive mail to almost everybody (just not to
the people using these lists).
Could anyone guide me to the best solution, the PTR or use my ISPs
dedicated outgoing mail and how to do it?
Thank you very much for your help
What blacklist was this? There are a lot out there, and some are better than
others. Many are run by well-meaning but overzealous people. You might talk
to the recipient (on the phone) and see if you can get more info from their
admin.
First, I'd talk to your ISP to find out what *they* are doing about this -
it's their IP block, and they're probably running into this with others. See
whether there are any options - new public IP in a different subnet?
If you can't get help that way, find out your ISP's SMTP server name, and
whether it requires authentication ....then you can specify that for this
domain only, mail is to go out through that SMTP server (not directly from
your server). You can do that in the built in SMTP connector - just specify
recipientdomain.com instead of * .
1. In Exchange System manager - find the built-in SMTP connector properties
2. Select 'forward all messages to the following smart host '- put in your
ISP's smtp server there (e.g., smtp.myISP.com)
3. Under local bridgeheads, select your server.
4. In the Address Space tab, add recipientdomain.com, SMTP - remove the *
which is a wildcard. You can also add other domains you want to specify,
too.
5. If your ISP requires that you authenticate, I think you put the
credentials in the Advanced button.
NB: Do not select "Allow messages to be relayed to those domains" or you'll
open yourself up to relay spam.
.
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