![]() ![]() ![]() Today, we saw how our Technical Team set up “DNS Blackhole Lists in Plesk” to fight against Spam.This article may need to be rewritten to comply with Wikipedia's quality standards. To be more precise, “DNS Blackhole Lists” is a powerful tool to avoid spam activities like junk and malicious emails. To fix it, our Dedicated Engineers add Google Public DNS (8.8.8.8) in the resolvers list. This happens when there are problem with DNS resolvers on the server. There can be cases where the Blackhole lists do not block any mail on the server. Your SpamAssassin version should be upgraded if it’s an old version, only then it queries DNS zone entry listed in DNS Blackhole Lists. Often outdated SpamAssasin create problems with DNS Blackhole Lists. It results in “ This is not the DNSBL you’re looking for” error. This error happens when you incorrectly type the entry in DNS zone for DNSBL service. Related errors when setting DNS Blackhole Lists.įrom our experience in fixing the issues with DNS Blackhole Lists, the following are some of the related errors our Support Team found so far. Thus, it denied the messages from black listed IP addresses. Then, the logs started showing errors like 550 (connection refused). With that DNS Blackhole Lists was enabled on the server. In the DNS zones for DNSBL service input box, enter “ ” into DNS zones for DNSBL service.Select the Switch on spam protection based on DNS blackhole lists check box.In Plesk > Go to Tools & Settings > Mail Server Settings (in the Mail group).We performed the following steps to enable DNS Blackhole Lists. That’s why, we decided to enable Blackhole lists on the server. We could see that many mails originated from bad IP addresses. We found that there were suspicious emails. The very first step we did was to check the logs, to verify if they were really receiving any junk emails.Ģ. Let’s see how our Support Engineers used DNS Blackhole Lists in Plesk to prevent spam on the server.ġ. Customer had setup Plesk control panel in his server.Įven though they had configured SpamAssassin in Plesk, they were getting a lot of spam emails in the user’s mailbox. Recently, our customer approached us with the problem like “ they are getting a lot of spam emails” in their inbox. This is one of the options that our Dedicated Engineers recommend to customers with Plesk servers. That’s where DNS Blackhole Lists (DNSBL) has a major role to play. However, many servers still face spam problems. Enable DomainKeys or SPF (Sender Policy Framework).Use SMTP authentication when configuring the email client.Limit the size of email coming to the server.Setting a strong password when creating an email account.Plesk provides many methods for spam protection. Nowadays, most of the mail servers have configured to reject or flag messages when sent from an IP listed in DNS Blackhole Lists. Knowing more on DNS Blackhole List in detail…įirst, let’s understand further on DNS Blacklists.ĭNS Blacklists or DNS Blackhole Lists (DNSBL) is a service that contains a set of IP Addresses that are involved in Spam activities. Today, we’ll see how our Support Team prevent spam by setting up “DNS Blackhole Lists in Plesk”. That’s why, we often get requests from our clients to prevent spam on the server as part of our Server Management Services. With hundreds of spam in your inbox, you can lose the important email. ![]() Unfortunately, junk mail, more commonly known as spam, is one of the big problems of the email. It’s one of the keys for quick and easy communication. ![]()
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