http://www.emailtalk.org/blog IT Mail Server Administrators Tools, Tips, and Help Guides Fri, 05 Jun 2009 14:39:55 +0000 http://backend.userland.com/rss092 en Martuz.cn / Gumblar Exploit root cause of the OWA problem Symptoms of Microsoft Exchange 2003 Outlook Web Access and martuz.cn JavaScript virus infection Within the last few days one of our main Exchange 2003 Server Outlook Web Access became painfully slow.   Symptoms were related to main browser window in Internet Explorer displaying ... http://www.emailtalk.org/blog/martuzcn-gumblar-exploit-causing-microsoft-exchange-2003-owa-to-run-extremely-slow-after-login-and-how-to-fix-this-problem/ Phishing is a fraudulent act committed by individuals who want to gain access to sensitive personal information for an array of purposes. Contrary to what many believe one of the best ways you can protect yourself from phishing isn’t to install defense programs or increase security measures, but instead ... http://www.emailtalk.org/blog/phishing/ What is Spam? Spam can be generalized and defined as unsolicited emailing that’s usually sent out to several email addresses in bulk. Spam emailers have created their own “gated” community within the Internet; they’ve separated themselves from all politics and rules pertaining to the Internet and have constructed their own methods. ... http://www.emailtalk.org/blog/high-cost-effects-spam-businesses/ A DNS Root Name server is a server that answers on behalf of the DNS root Zone, and redirects requirements for a given TLD (Top Level Domain) to that particular TLD’s name servers. The term “root name server” is normally used to describe the thirteen organizations often referred to as ... http://www.emailtalk.org/blog/dns-root-servers-explained/ 1. Installation on Unsupported Hardware Unless there is a very good reason not to, always install Exchange on hardware supported by Microsoft.  Consult Microsoft's Windows Server Catalog (formerly the "Hardware Compatibility List," or HCL) for a complete list of compatible, supported hardware.  In order for a system ... http://www.emailtalk.org/blog/common-mail-server-configuration-mistakes/ A denial of service (DoS) attack is an attempt to deny a user from accessing the available computer resources and services. It can be targeted towards a single system or a group of systems. In the event that a great number of systems are attacked, it’s called a distributed denial-of-service ... http://www.emailtalk.org/blog/dos-denial-service-attack/ RBL RBL is an abbreviation for “Real-time Black List”. An RBL is a list of 'known' SMTP servers notorious for sending SPAM. The List is regularly updated with new potentially harmful entities. These entities might be a list of domain names, IP addresses and viruses that are known to cause or ... http://www.emailtalk.org/blog/rbl-white-list/ The contents of emails that spammers have been sending within the past few years have been evolving with incredible craftiness. These emails seem to surpass simple-minded spam filters that we blatantly continuously install. We read spam, curse spam, and have come to hate spam, but what if there was an ... http://www.emailtalk.org/blog/bayesian-spam-filters/ Dealing Effectively with Spam Any business that believes spam is merely an annoyance in the office is sadly mistaking. A 2007 report by Nucleus Research shows that spam costs organizations in the United States $712 per employee every year. According to Nucleus, that adds up to an estimated $70 ... http://www.emailtalk.org/blog/spam-small-business/ In order to be effective at distinguishing spam from legitimate emails, a spam filter needs to rely on various methods. Some of today’s most popular programs utilize blacklists and whitelists to filter out junk mail. As you’ve probably guessed, these counterparts are the exact opposite of one another. Senders listed ... http://www.emailtalk.org/blog/spam-filter-blacklists-whitelists/