My Company's IPs have been listed on SORBS DUHL under a netblock of 256 addresses. I have contacted my ISP to try and get delisted. I also submitted my own request to SORBS through their system. Is there anything else I can do? The weird thing is we have a static block and DUHL is for dynamic addresses. Please help.
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B HCommented:
we have an ISP out here, centurytel, that doesn't know the difference between residential and business... they group everyone together in random netblocks.

sorbs will always block residential ip ranges, because those home users are supposed to use their smarthost to send from.

your company fell in a group of residential people, and are thus blocked

i would fight for a new static ip which is outside the residential ranges... or jump ship to another provider if you can.

otherwise, you'll need to forward all your outgoing mail to the isp's smarthost and hope people aren't checking 2+ levels deep like i do
LCNWAuthor Commented:
I've done what I need and SORBS says they're delisting me, so we'll see. My ISP says that SORBS is being less than helpful.
B HCommented:
sorbs won't delist your netblock - if they do, it'll only last a few hours

sorbs won't help your isp either, it's not their job to help them... they block spam ranges, that's what they do.. unfortunately, the home ranges send the most spam

the right way to do it, is like this:
your isp gives one range for homes, and blocks outbound port 25 except to their own smarthost relay
your isp gives another range to businesses, without port 25 blocked

that's the only way sorbs will unblock a range.

since none of the above is likely to happen, your immediate course of action should be to tell your exchange server to forward all outbound mail thru your isp's smarthost - which isn't blocked by sorbs...  

or get a new ip address outside of the blocked range, and be sure to update all your external dns hosts
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LCNWAuthor Commented:
I didn't delist the netblock, just the IP tied to our MX record. I created a PTR (rDNS) and increased the TTL to the 12 hour minimum they require and the robot accepted the request.
B HCommented:
i wonder how long it'll stay off the list :/

have you checked the other databases?
LCNWAuthor Commented:
I'm green on all of those lists.
B HCommented:
well, to your original question about how to prevent it from happening again ...  you have to get your ISP to give you a static block outside of their dynamic home-user allocation groups.  if they don't understand this, or if they randomly dish out their entire netblock, they will need to make changes to how they allocate addresses, and then they'll have to contact sorbs and prove the changes.  sorbs will then adjust their block list.

you're lucky that sorbs removed you this time - but in my personal experience, it'll only last a few days.

another option to prevent it from happening, is to tell your server to dump all mail thru the isp's smarthost rather than deliver it directly by dns lookups

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