Tag Archives: spam

July, 2010

• 16 July

  How to Fix an Open Relay in Postfix

  

  As I have been reiterating all week, an open relay is a bad idea. If your mail server is left open, anyone can use your SMTP service to send mail, and spammers will use it. This can result in your server being blacklisted and extraneous use of system resources that …
• 15 July

  How Do Spammers Send Spam from My Server?

  

  When your server has become a haven for spammers, it is never a pleasant ordeal. Your server will probably be blacklisted, causing many of the emails you send to bounce back, and you may have serious connection problems due to the spammer using valuable system resources. There are a couple …
• 15 July

  Mail Server Causing High Server Load

  Question: My CPU usage on my server is very high, and it seems to be originated from my mail server. What could be the problem? Answer: If your mail server is sucking up valuable CPU power, there are a couple of possibilities, none of which are pleasant. 1. You or …

June, 2010

• 7 June

  5 Indispensable DNS Tools

  1. Traceroute – With this quick tool, you can trace the network path from your server to any destination, including your house. If you ever have connection problems with your website or server, this tool may give you clues. 2. IP Whois – Find out what a website’s true IP …

May, 2010

• 18 May

  E-mail Address vs Contact Form

  You want to make sure your website visitors can contact you, and you have made every effort to make sure they can find the “Contact Us” page, but what do you want to include on the page? Should you list your email addresses, have only a contact form, or provide …
• 17 May

  When You Are Accused of Spamming…

  Question: My web host has accused me of being a spammer and has suspended my account. How do I prove I am not a spammer? Answer: Usually, you will only be accused of spamming in one of three situations: (1) you actually are a spammer, (2) your account is hosted …
• 10 May

  Catchall Email Addresses

  In the world of web hosting, email addresses can either be real or aliases. A real email address is connected to a mailbox on the mail server. That mailbox will hold any messages sent to the address in queue, awaiting the user to either download it or access it from …
• 4 May

  MailScanner: Anti-Virus and Anti-Spam Filter

  As the name implies, MailScanner scans incoming mail sent to users on a server and flags them, and handles them according to the server administrators configurations. It is one of the most popular virus/spam filters It is written in Perl and links with other packages in order to accomplish its …

March, 2010

• 31 March

  How to handle known spammers

  When you are faced with relentless spamming, it is a good idea to use tools that go beyond simple filtering. One way to stop SPAM is to develop some type of proxy that stops known spammers before the messages reach the mail server. Another is to rely on DNS black …
• 31 March

  How to create a tmp partition in Linux

  As we mentioned in a previous post, setting up extra partitions beyond the standard Linux partitions can have certain security and performance benefits. One of the major directories that you should consider partitioning is the /tmp directory. In Linux, temporary files are stored there and accessed when applications need to …