spamhaus

Troubleshooting methods for enterprise mail servers that are frequently blocked by spamhaus anti-spam organizations In fact, in the process of enterprise mail platform management, enterprise mail administrators are often troubled by a variety of mailbox problems. The biggest problem is the difficulty of server maintenance caused by improper server planning, the most critical and worrying thing is that enterprise mail is often blacklisted by some inter

/apache2/mods-available/antiloris.conf # Maximum number of parallel connections for each IP address in the READ status IPReadLimit 5 Prevent DNS injection attacks The Spamhaus module uses the domain name system blacklist (DNSBL) to prevent spam forwarding through Web forms, prevent URL injection attacks, and prevent http DDoS attacks from bot programs, it usually protects the server from known malicious IP addresses. $ sudo apt-get -y install libapa

method to deal with spam, it is based on the need to create a large list of filtered keywords. This technical flaw is obvious, the filtration ability and the key words have the obvious connection, the list of keywords may also cause the error newspaper to be bigger, certainly the system uses this technology to process the mail the time consumes the system resources to be more. And, the general avoidance of keyword technology such as the word-breaking, the group words can easily bypass filtering

per unit time for precise identification. In a TCP connection, too few HTTP messages and too many packets are abnormal. too few may be slow connection attacks, and too many may be HTTP Flood attacks using the HTTP1.1 protocol, send multiple HTTP requests in a TCP connection. The second is to limit the maximum allowed time for HTTP header transmission. After the specified time is exceeded, the HTTPHeader has not been transmitted yet. the source IP address is regarded as a slow connection attack

, can deal with this problem, but the cost above the relative also increased, need two lines of cost.Also, my IP into the CBL anti-spam blacklist, the complaint to delete CBL. But has not been successful, online check let a change IP can. What to do with this. General mail export IP into the Rbl,pbl,spamhaus related anti-spam list, is more normal, and some foreign anti-spam Alliance is directly add China IP segment directly to the blacklist, and not o

: 515px;height:304px; "/>Of course, the above is only a network interconnection problem, and now the enterprise generally choose double line, can deal with this problem, but the cost above the relative also increased, need two lines of cost.Also, my IP into the CBL anti-spam blacklist, the complaint to delete CBL. But has not been successful, online check let a change IP can. What to do with this. General mail export IP into the Rbl,pbl,spamhaus rela

isolation capabilities. Unfortunately, there is no product that has a large and active development and user community like SpamAssassin. However, SpamAssassin itself is not perfect, it is not in the forefront of spam recognition. At present, in anti-spam technology, based on the "reputation" of the filter system and a good combination of content filters, the effect is very good, while the Sender ID and the domain keys and other new protocols can help combat phishing attacks. As a result, IT ma

source IP address is regarded as a slow connection attack, and the connection is interrupted and added to the blacklist. 4. New attack methods DNS reflection/amplification attacks use the DNS infrastructure on the Internet to enlarge the traffic generated by attacks. DNS is an important part of the Internet infrastructure for host name to IP Address Resolution. DNS reflection/amplification attacks send queries to multiple open DNS Resolvers by using multiple client bots (bots botnets, as a r

/mailhandler/bin/check_mailhandler C. Modify the mailworker configuration file # Nano/opt/maildesk/ ETC/CONF. d/mymaildesk. Conf The content is as follows: Run As User = postfix Run As Group = postfix Incoming Queue Dir = /var/spool/postfix/hold Outgoing Queue Dir = /var/spool/postfix/incoming MTA = postfix Always Include SpamAssassin Report = yes Send Notices = no Spam List = RFC-IGNORANT-DSN SORBS-SMTP spamhaus-ZEN spamcop.net CBL Spam Lists

users with more accurate results than before. In fact, the free blacklists such as spamhaus.org and sorbs.net not only list the network segments of common spam servers, it also lists the dynamic IP addresses of spammers connected through home broadband and botnets controlled by hackers to send spam. How popular are these blacklists? According to Steve Linford, who works at spamhaus.org, The spamhaus network receives 80 thousand to 0.1 million search

, then u-mail mail relay technology processing, will mail through Hong Kong, Japan's delivery path, not affected, and all the path selection is automated by the system, without manual intervention.Well, U-mail mail relay has successfully solved the "news one" problem, and when the "news two" described in the network attack, if you use the U-mail mail relay technology, you can also be in the mail server/client in the case of virus spamming the situation to provide normal mail services.650) this.w

your IP address is listed in the blacklist, you need to communicate with them to solve the problem. The solution is complicated and will not be detailed here. If you have this problem, please reply to the list of organizations that have been blacklisted, I will give you an unblocking solution for that organization.Let's talk about a few big ones:(1) first, spamhaus.orgThe most severe, the most influential to the spamhaus project team, web site http:/

The company's Domino Mail Server was recently attacked by spamhaus In the XBL blacklist. The situation was urgent and all emails sent from the company to foreign customers were rejected, however, rejected emails are delayed in the shuttle fish spam gateway queue. In this case, only the XBL blacklist can be removed first, so that these emails can be sent first, and then perform the following self-check! In case it is blacklisted again !!!1. check wheth