Re: I keep getting blocked by Comcast

Jeff,

Can you please give some info on your ISP setup? Are you using them as a Smarthost or anyone else for that matter? Do you have a Business Static IP account from your ISP or is it Residential? I would suggest the Smarthost option as this point as your ISP mail server IP range are mostly whitelisted and would allow the mail to go through. Please clarify. Thanks.

--
John Oliver, Jr
MCSE, MCT, CCNA
Exchange MVP 2010
Microsoft Certified Partner


"Jeff" <Jeff@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message news:9F47B39F-4C81-4F27-BE7D-8E3239418662@xxxxxxxxxxxxxxxx
Yes,

I have an SPF record and reverse DNS Lookup that is configured properly.
I've done a lot of those online "tests" and it always comes back ok.

They don't give a reason. Once you fill out their form to get unblocked they
send an auto generated email saying:

"Our filters have determined that email from the IP you submitted was
blocked because it sent email to the Comcast domain with patterns
characteristics of spam. Mail servers are typically shared by many users so
it may be the case that another party using your mail server has sent spam,
even if you have not....."

Any other ideas to see if our sever is actually sending spam without me
knowing?


"John Oliver, Jr. [MVP]" wrote:

Do you have an SPF Record? Do you have Reverse DNS Lookup Record? Verify
this and if you are Blacklisted for any reason at www.dnsstuff.com. Does
Comcast give a reason as why they are blocking you?

--
John Oliver, Jr
MCSE, MCT, CCNA
Exchange MVP 2010
Microsoft Certified Partner


"Jeff" <Jeff@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:6EE5C287-B030-4704-AD0C-A314F9A640AC@xxxxxxxxxxxxxxxx
> Hello all,
>
> Several months ago my company could not send emails to Comcast. I found
> out
> we were blocked. I filled out there request form to get unblocked and a
> couple of hours later they opened the pipe.
>
> Now, about once a month we keep getting blocked. Only from Comcast. I > then
> fill out their form and they unblock us.
>
> I am running Exchange 2003 and using Symantec's Mail Security for
> Microsoft
> Exchange. This seems to do a pretty good job blocking incoming spam.
>
> Any idea why they continue to block us? What can I look at the help
> resolve
> this??
>
> Thanks,
> Jeff

.

Relevant Pages

  • Re: Have all the Email systems of the world been broken by ISPs SPAM filters?
    ... > stopped working a few weeks back when their ISP installed a new SPAM ... > from one mail to another mail server are broken! ... I don't like server-side spam filtering that doesn't allow the users access ...
    (microsoft.public.security)
  • Re: OT: Stopping Spam
    ... my ISP, Demon, didn't send me any such messages. ... /In theory/ if a mail server cannot deliver a message, it should be returned to the originator, in order that the originator can take corrective action. ... However, the originator is usually forged in spam emails - so there's no point returning anything, but worse, it would annoy any real owner of the forged address, and such bounces could themselves be used to deliver spam from a legitimate mail server. ... Whether this was the actual problem you mention with demon is another matter. ...
    (uk.legal)
  • Re: unwanted uncoupling using Kadee couplers - magnets
    ... Using the reply domain as a means to filter incoming email isn't very ... I use Mailwasher (in addition to ISP ... I think two bits of Spam reached my ... throught the 2mm.org.uk domain mail server on their original path. ...
    (uk.rec.models.rail)
  • Re: How does Cron send email?
    ... Spam is invariably sent from somebody else's computer ... or through a mail server configured as an open ... Windows machine that uses your ISP e-mail server to connect to. ... have much problems with supporting the SPAM from machines they service ...
    (Debian-User)
  • Re: Cost of process creation on Unix
    ... > addresses to any mail server or blocking list operators that ask them. ... > Comcast has an exception for specific rDNS addresses. ... > So being in some lists is almost meaningless. ... it means that your ISP is saying that your I.P. address is subject ...
    (comp.os.vms)