How to Prevent Outgoing Spam on Your Server

Often when we think of spam, it usually relates to incoming spam inundating mail servers and bogging down systems. Another way spam can harm your dedicated server is from the inside.
Many spammers do not setup their own servers or paid hosting accounts to send spam. They want to be anonymous. Therefore, they often use other […]

Linux Server Security Guide: Part 5

Malware and Spam
Of all the security problems a server might have, malware and spam are particularly despicable. Few things are worse than finding out you have a virus or other malware infecting your system.
Linux servers do not have to worry about nearly as many viruses as Windows servers do. Nevertheless, you should still […]

Is Your Server a Tool for Cyber-Criminals?

Protecting your dedicated server from cyber-attacks is always a critical part of system security. You have, after all, invested time and money into protecting your websites and the websites of any clients you might have. Nevertheless, you should not assume that everything is fine with your server simply because it appears to be functioning. It […]

Troubleshooting High Mail Server Loads

These days many personal email accounts are hosted on cloud servers, leaving many web servers without the need to send and deliver emails to their users. For plenty of businesses, however, having a mail server is still very much a part of the dedicated server experience.
If you host your own mail server, whether Postfix, Sendmail, […]

Anti-Virus and Anti-Spam Tools for Linux Servers

Desktop Linux distributions have a distinct advantage over Windows.  They are not plagued by the millions of viruses that circulate the Internet wreaking havoc on unsuspecting PC users.  These viruses are designed for Windows and normally only affect Windows systems.
Despite the apparent immunity Linux enjoys, a Linux server should still have some type of […]

The Pros and Cons of Cloud Email

Cloud computing has become a very popular option for many businesses hoping to offload some of the expense of maintaining their own mail servers. Cloud email services are easy to setup and use, but there are both advantages and disadvantages to using them.
The Pros

No maintenance – Forget about catching spam and viruses.  Your service provider […]

7 Lessons I Learned from Having My Own Server

For several years I leased an unmanaged dedicated server from a company that will remain nameless. I loved the experience, but there were plenty of times when I made horrible mistakes. The following are seven lessons I learned from having my own server.
1. Whatever I thought I knew was far less than what I needed […]

The Value of SPF Records

SPF stands for Sender Policy Framework, and it is the standard established in RFC 4408. Essentially, SPF validates emails sent to a mail server to determine if a message is spam. One of the biggest problems faced by ISPs trying to fight spam is the spoofing of IP addresses and domains. In […]

Keeping a Server Maintenance Routine

We all know that server maintenance is important, but how many of us really take the time to stop and think about it? Because it is so easy to forget a particular task, it is crucial to your dedicated server’s health that you keep a regular routine for maintenance.
In some cases, certain parts of […]

4 Great Uses for Proxies

When many people think of proxies, they often imagine public school Internet filters or the tools people use to circumvent them. There are, however, numerous other uses for proxies, especially for dedicated servers.
A proxy is basically a network layer that sits between the computer and the Internet. All traffic passes through the proxy, […]

How to Fix an Open Relay

According to spamhelp.org, an open relay is “a mail server that does not verify that it is authorised to send mail from the email address that a user is trying to send from. Therefore, users would be able to send email originating from any third-party email address they want.”
Using an open relay, someone could […]

What is DNSBL and Why Should I Care?

DNSBL stands for DNS Blacklist or Block List and is a list of IP addresses, distributed throughout the Internet, identifying computers or networks accused of spamming. Many web hosts and Internet service providers (ISP) use these blacklists in their anti-spam filters to help keep spam from reaching their users.
DNSBL have received mixed reviews and […]

What to Do When You’re Accused of Spamming

No matter what precautions you take or how many hours, days, or even weeks you have spent hardening your server’s security, the possibility of being accused of sending spam still exists. This can cause you all kinds of problems, from the inability to send mail to certain Internet Service Providers (ISP), to having your […]

Best Server Anti-Virus and Anti-Spam Tools

Those who love Linux often cite the absence of viruses as one of the shining examples of why it is better than Windows. For the most part, that argument is valid and real, but a server administrator must look beyond his/her own system and consider others as well. Your server may not have […]

How to Change the Port Number in Postfix

The default network SMTP port for Postfix, Sendmail and most other mail servers is 25. This is the port used to send email, and most email clients will use it by default. Unfortunately, some Internet service providers have started to block port 25 because of the high volume of spam sent through it. […]