Home Server vs Hosted Server

So, you have to decided to get your own dedicated server. You certainly have a plethora of options to consider: hardware, operating system, development platform, applications, and more. One of the crucial early decisions you must make is to decide where you want your server to be housed.
If you are running a business, […]

How Many IP Addresses Do I Need?

As you may have heard, there are a finite number of IP addresses available to Internet Service Providers (ISP). Once they are all used up, the only way to get more is to reassign them. In technical terms, the limited number of IP addresses refers to the IPv4 address space, while there is […]

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 […]

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. […]