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December 2006 - Posts
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An article published yesterday in Business Week argues that Cyber Criminals are targeting small business. The article suggests that small businesses make easy, or easier targets than larger enterprises because small businesses typically cannot allocate Read More...
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In the past several days, we have seen a large number of both SBC Global and Comcast users with blacklist problems. Predominately, the host IP Addresses are showing up on the Sorbs Dynamic User and Host List (DUHL) blacklist. By extension, users are seeing Read More...
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The latest DHA 'infestation' appears to be targeting recipients' Accounting Departments -- using subject lines such as: "Billing Update, Claim (or Form) #***", "August Payment (or Bill) Summary, Invoice #***" and others. When the message is checked for Read More...
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A situation that arose today illustrates the problematic nature of RBL use for spam filtering : A business owner who had been using the same email address to correspond with a client for the past seven years suddenly got a bounceback message from that Read More...
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While the majority of requests since Friday have been from a large variety of ISP accounts...the common thread has been the continued elevation of reverse DNS issues. Most common scenarios have shown outbound IP addresses ("A" records) matching up with Read More...
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Things have pretty much returned to normal over the weekend -- we're seeing the usual scenario: RBLs such as SORBS, SPAMCOP, FIVETEN and others are netblocking entire IP address ranges from ISPs that have included known spammers in the past...which means Read More...
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MX Toolbox blacklist consultants report a significant upward trend in the number of mass mailer worm infections leading to blacklisted mail servers. These infections are spewing third party spam from legitimate mail servers and landing businesses on email Read More...
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MX Toolbox has removed the BLARS Blacklist from the free blacklist lookup tool . BLARS is notorious for false positives and high costs to get unlisted. Now, it seems that the list is defunct (we are not positive when it happened, but BLARS.org is currently Read More...
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For our first post to the MX News Blog, we thought it would be appropriate to talk dive into the hot story of the late fall/early winter- Spam rates have soared (sored) into the stratosphere. According to Postini, Spam volumes increased by 60% in September Read More...
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The past week's requests for assistance with blacklist problems have shown an unusual increase in bounceback messages from recipients stating that SORBS has identified spam coming from their specific mail servers. Meanwhile, the ongoing scenario of static Read More...
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Typically, the biggest issue we see week-to-week involves non-spamming companies that have been caught in blacklist spam traps which block entire ranges of suspected spamming IP addresses. However, over the past few days several RBLs (including SORBS, Read More...
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SORBS blacklist entries are rising slightly, but today we've noticed more entries listing "exploitable server" and fewer listing "dynamic IP address". Also, there has been a minor influx of "open proxy" listings on other RBLs, such as DSBL, NJABL, PSBL Read More...
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While the number of SORBS blacklist entries have declined dramatically since last week, we are noticing an uptick in Non Delivery Reports (NDRs) from ISPs such as Verizon, Yahoo, SBC and Hotmail. In most cases, it appears that these ISPs' latest netblocks Read More...
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Far and away, the most common delivery issue for Monday and Tuesday has been bouncebacks due to the SORBS blacklist. Based on the reports we've gotten so far this week, the latest SORBS dynamic IP listing update has included a great number of static IP's Read More...
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We reported yesterday that the INTERSIL blacklist went dark as the domain registration lapsed. This was causing every IP address tested against their RBL to appear to be listed. They have restored DNS service and the list appears to be working again. Read More...
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A seldom used DNS Blacklist is causing email delivery problems for some of our customers. Apparently this list has been abandoned by the operator. It had been returning a Not listed result for all IP addresses checked. As of a few days ago, the domain Read More...
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After a strange week, SMTP transaction times have returned to normal levels. Friday has averaged 4.5% faster response than expected. As expected, we see a sharp drop-off at 4:00pm CT (5:00pm in the East), as people flee their cubicles for some R&R Read More...
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The trend we saw beginning Monday morning continues. Tuesday is winding down with an unusual 31% increase in SMTP transaction times. We have seen no unusual reports from our email user base, but continue to look into the root cause and will post more Read More...
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We have monitored a very large increase in SMTP transaction times throughout the day, peaking at 3:00pm CT. SMTP transaction times for the day are 22% elevated over a typical Monday. The trend started at exactly 9:00am CT as users returned to Read More...
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