Simple Thoughts was chosen as the name of this blog in distant past to highlight my approach - simple solutions for complex problems. The name stuck over the years. However as many pointed out that Simple Thoughts is about Web software & technologies like WordPress, Java, PHP etc.; none of which is reflected in the name. It is a technology centric blog. What would you, my reader, suggest as the most appropriate name for this blog?

Sometimes you need to view the full email headers to understand whether an email sender information or other details is faked or to even debug your MTA (my situation). Unlike other email clients GMail doesn't give you an intuitive way to get the full headers. Nevertheless when you know it, it is very simple. Here are the steps:

Postfix is an excellent and powerful mail transfer agent (MTA) like sendmail. You can configure postfix to send outbound mails directly (default) or relay it to another MTA, which could be postfix or sendmail. However you don't want anyone to be able to relay mails through the server. So normally MTA's are configured to relay mails from trusted and/or authenticated networks only (configurable). Another option is available when your local MTA has a fixed IP address. However for all other cases using SASL is a very secure and easily configurable option as detailed below.

Shorewall is an excellent free linux firewall which provides unparalleled level of fine grained control. It not only acts as a firewall and Gateway, it also supports DMZ, IP Masquerading (NAT & SNAT), Proxy ARP and more. In short Shorewall is your one stop solution for complex networking routing needs, flexible & controllable internet connectivity options.

Sometimes windows installers come with msi extension instead of regular exe extension. Such software can be installed with the msiexec command which comes with wine. For example to install a file setup.msi you will run: msiexec setup.msi