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SMTP Auth Relay Attacks/ ORF |
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Written by Administrator
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Sunday, 04 December 2011 06:51 |
What Is an SMTP AUTH Relay Attack?Spammers often use open relay mail servers to hide their identity. These servers does not have proper limitation on relaying, they accept mails from everyone and deliver to everyone. Most mail servers on the Internet are secured against unauthorized relaying using IP-based relay restrictions, but many of them still allow authenticated users to relay. This is the default setting on Exchange 2000/2003 servers and it is not a security risk as long as the user accounts are protected. Starting from July 2003 we received a number of reports from ORF users complaining about unexpected authenticated sessions showing up in the ORF logs, increased network traffic and unwanted relaying. Soon after the first reports we realized that spammers invented a new technique to hijack mail servers: they search for weakly protected user accounts by SMTP authentication attempts and use the accounts discovered to get relay rights. Once they successfully authenticate using the user credentials, they are granted to relay via the server, which is then used to send spam.
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Last Updated on Sunday, 04 December 2011 06:55 |
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Purge Exchange 2000/2003 queues |
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Written by Administrator
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Sunday, 04 December 2011 06:42 |
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Last Updated on Sunday, 04 December 2011 06:44 |
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Setting Message Size Limits in Exchange 2010 and Exchange 2007 |
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Written by Administrator
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Sunday, 04 December 2011 06:31 |
In Distribution Groups and maximum recipients per message, we looked at how the maximum recipients per message settings are treated differently by Exchange Server 2010/2007 and Exchange 2003/2000 when sending to Distribution Groups. Message size limits are an important mechanism to control mailbox sizes, guarantee service availability, and protect from potential DoS attacks. Another commonly asked question is about message size limits and the inability to send messages that are apparently within the maximum sizes configured. Let’s take a look at the message size settings in different places in Exchange 2010 and Exchange 2007.
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Last Updated on Sunday, 04 December 2011 06:39 |
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Written by Administrator
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Sunday, 05 June 2011 06:50 |
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The 30 days is the initial set up of Windows Server 2008 R2 without a license key. Run the following command - slmgr.vbs -dli to show the statis of the activation period. Run this command - slmgr.vbs -rearm - to extend the trial period up for 60 days, up to a maximum of 180 days.
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Written by Administrator
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Saturday, 23 April 2011 05:00 |
Thailand Outgoing Mail Servers For Thai Internet ProvidersPlease Note: We can make no guarantees as to whether these work or not as Thai Internet Service Providers change their outgoing mail servers from time to time. So to be sure, please contact your Thai ISP to confirm the correct outgoing mail server so you can send emails from your email programme. TOT
TTT
CS Loxinfo
True Wifi
HiNet (CAT)
Ji-Net (MAXNET)
KSC
Pacific Internet
Internet Thailand
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Last Updated on Sunday, 04 December 2011 06:57 |
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