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elemist
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Black Listed!

Howdy All,

Once of my customers mail servers appears to have been black listed by a few different places.

I think i've found most of the places where they've been listed and the relevant request to be removed from the list.

However before i can do that i need to find out why they've been blacklisted to begin with. How can i determine what's caused the black listing?
Exchange

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elemist

8/22/2022 - Mon
ASKER CERTIFIED SOLUTION
Kash

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elemist

ASKER
Yeah i'm assuming its a SPAM issue. I've gone through the links for the bounce backs which give the usual list of things - infected machine, incorrectly configured mail server and the likes.

I'm just about to modify the firewall to block all outbound connections on Port 25 except from the mail server. Assuming its not the server itself this should stop the cause.

I've looked through the AV logs but there's nothing much untoward listed and as there's nearly 50 odd computers, some of which are offsite in rural locations it's a bit difficult to physically check for spyware.

Is there a way to find the troublesome machine/machines?
Alan Hardisty

Which blacklists sites were you / are you listed on?

What version of Exchange do they have?  2003 by any chance?
elemist

ASKER
The two i'm aware of are

Spam Cop
Barracuda Networks

No its sbs 2011 - so Exchange 2010
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SOLUTION
Alan Hardisty

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elemist

ASKER
They both just seam to list generic reasons. I've requested removal from both and hopefully with the port blocking in place it won't happen again.

Thanks for the advice!
elemist

ASKER
Thanks!