exchange on blacklist


We are running an exchange server 2010 in the datacenter. Different company's are on the same exchange server.

the exchange server has only 1 public ip.

now company x has been spamming and the exchange ip adress is now on a blacklist.

also resulting that the other company's cannot email anymore.

is there a way to prevent this? can exchange use multiple ip's? ex, for each company or is there another great solution?
Rik Van LierCEOAsked:
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MASEE Solution Guide - Technical Dept HeadCommented:
You should have one IP as a backup to use in emergency cases.
please check balcklist using
Request to delist the IP.
Before requesting for delisting please make sure spamming is stopped.
Otheriwise it will get listed again.
Yes you can have multiple IP addresses on your Exchange server. One thing that you could do is setup another IP address and set the MX records for some companies to the new Ip address, that way when their DNS entry is looked up it comes up with a non blacklisted IP address.

Oh and ditch the company that's spamming :-)

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Tony GiangrecoCommented:
You should install anti-spam service for incoming and outgoing email. This greatly reduces the chance of that happening. I suggest trying GFI Mail Essentials. We have used it for eight years and it works very well.

I would also move each company to it's own static public IP address. After that, you can email the organization of the steps you have taken and most of the time they will remove that Ip/Domain from the black list within 24 hours.

I had that happen to a client before and know how painful it can be. Hope this helps!
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