What is spamhaus and how to i remove it?

One of our computers will not send emails because spam haus  is blocking it. We think its because he updated avast on his computer around the same time this started happening. This is not happened to any other computers in the office! We need to remove all anti spam on his computer or he will not be able to send emails.

this happens with Thunderbird and outlook.

Thank you

Rob
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robaikenAsked:
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Kerem ERSOYConnect With a Mentor PresidentCommented:
Hi,

spamhaus is an RBL system. RBL is a mechanism to insert known spammers in a DNS and wehn queried returns 127.x.x.x to the querying SMTP host.

IS your host using a dynamic IP address??


First of all check your IP against spamhaus database here: http://www.spamhaus.org/lookup.lasso

To find your clients IP addressees you can use here: http://showip.net/

If the IP address you get from here is ni spamhaus list apply for removal from the same spamhaus page.

Since spamhaus runs on the receiving SMTP server it is not possible for you to stop it it is not advisable neither. Let me tell you this without RBL sites my e-mail server catches 20 to 30 000 SPAM mails every day. But when I apply RBL sites such as spamhaus. my daily spam hit is down to 300 -500 e-mails each day :) So you should fined a way to delist your IP rather than disabling it even if it is possible.

Cheers,
K.

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Alan HardistyConnect With a Mentor Co-OwnerCommented:
How come it is just one of your users - do you have multiple IP Addresses?
Most companies / home users only have the one, so in theory, you should all be blocked.
Please describe your configuration a little.
Also check on www.mxtoolbox.com/blacklists.aspx for other Blacklistings.
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ElrondCTConnect With a Mentor Commented:
Spamhaus doesn't block email from being sent; it blocks it from being received (by subscribing email systems). Avast has nothing to do with it, though if you didn't have good AV protection on the system for a while, the computer might have gotten infected and started generating spam, which got it put on Spamhaus's list.

How is your email set up? Does each computer connect to an account maintained by your ISP? Do you have an Exchange email server? What is happening when the affected computer attempts to send an email? (Please describe precisely--what error message do you get, does it happen as soon as you send the message or as a response back from the receiving email system, etc.) Does the same thing happen if the affected computer sends a message to its own address?
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